Re: Gigabit interface on Linux?
On Mon, Sep 29, 2008 at 6:45 PM, Bruce Hayden [EMAIL PROTECTED] wrote: That's because, as Mark said, you're attached to a virtual device, and the speed doesn't have much meaning. Any data flowing Linux to Linux within the same vswitch could flow much faster than a gigabit, but data flowing out the physical port is limited by the connection on that port. The virtual NIC is only indirectly related to the physical port. Or it could be slower because of the CPU cycles needed to drive the virtual NIC and process the packets inside the Linux system. Doing the right measurements and determine the bottleneck is not always trivial. I have worked with one customer who was initially limited by the bandwidth of a single OSA. When they switched to two aggregated OSA's in a VSWITCH the extra throughput was about 20% because they now were limited by CPU. But with the numbers at hand you can at least make the trade-off and see whether the extra 20% is worth the cycles. Rob -- Rob van der Heij Velocity Software http://velocitysoftware.com/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' On Mon, Sep 29, 2008 at 10:14 AM, Mark Post [EMAIL PROTECTED] wrote: On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
Decent performance tools can be used to benchmark it. Create a benchmark from one linux server to the other and measure it. Scott Rohling wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' On Mon, Sep 29, 2008 at 10:14 AM, Mark Post [EMAIL PROTECTED] wrote: On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 begin:vcard fn:Barton Robinson n:Robinson;Barton adr;dom:;;PO 390640;Mountain View;CA;94039-0640 email;internet:[EMAIL PROTECTED] title:Sr. Architect tel;work:650-964-8867 note:If you can't measure it, I'm just not interested x-mozilla-html:FALSE url:http://velocitysoftware.com version:2.1 end:vcard
Re: Gigabit interface on Linux?
Right -- that was step 2 -- I was hoping there was some Redhat command that could tell us (one that works on s390x distros) ... Thanks, Barton -- we'll see what we can find out thru our own measurements.. Scott Rohling On Mon, Sep 29, 2008 at 11:24 AM, Barton Robinson [EMAIL PROTECTED] wrote: Decent performance tools can be used to benchmark it. Create a benchmark from one linux server to the other and measure it. Scott Rohling wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' On Mon, Sep 29, 2008 at 10:14 AM, Mark Post [EMAIL PROTECTED] wrote: On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
You'd need to get onto the HMC and use OSA Advanced facilities, select to view port parameters, and it will show you the current settings. On Mon, Sep 29, 2008 at 12:21 PM, Scott Rohling [EMAIL PROTECTED] wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... Scott Rohling On Mon, Sep 29, 2008 at 10:33 AM, Bruce Hayden [EMAIL PROTECTED] wrote: You'd need to get onto the HMC and use OSA Advanced facilities, select to view port parameters, and it will show you the current settings. On Mon, Sep 29, 2008 at 12:21 PM, Scott Rohling [EMAIL PROTECTED] wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
That's because, as Mark said, you're attached to a virtual device, and the speed doesn't have much meaning. Any data flowing Linux to Linux within the same vswitch could flow much faster than a gigabit, but data flowing out the physical port is limited by the connection on that port. The virtual NIC is only indirectly related to the physical port. On Mon, Sep 29, 2008 at 12:39 PM, Scott Rohling [EMAIL PROTECTED] wrote: Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... Scott Rohling On Mon, Sep 29, 2008 at 10:33 AM, Bruce Hayden [EMAIL PROTECTED] wrote: You'd need to get onto the HMC and use OSA Advanced facilities, select to view port parameters, and it will show you the current settings. On Mon, Sep 29, 2008 at 12:21 PM, Scott Rohling [EMAIL PROTECTED] wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
Ok - gotcha ... I guess I'm not thinking 'virtual' today ;-) ... On Mon, Sep 29, 2008 at 10:45 AM, Bruce Hayden [EMAIL PROTECTED] wrote: That's because, as Mark said, you're attached to a virtual device, and the speed doesn't have much meaning. Any data flowing Linux to Linux within the same vswitch could flow much faster than a gigabit, but data flowing out the physical port is limited by the connection on that port. The virtual NIC is only indirectly related to the physical port. On Mon, Sep 29, 2008 at 12:39 PM, Scott Rohling [EMAIL PROTECTED] wrote: Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... Scott Rohling On Mon, Sep 29, 2008 at 10:33 AM, Bruce Hayden [EMAIL PROTECTED] wrote: You'd need to get onto the HMC and use OSA Advanced facilities, select to view port parameters, and it will show you the current settings. On Mon, Sep 29, 2008 at 12:21 PM, Scott Rohling [EMAIL PROTECTED] wrote: Any ideas on how we can verify what the speed really is? Since they are seeing this number - there is now doubt in the air :-) Scott Rohling p.s. ethtool eth0 return 'No data available' -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- Bruce Hayden Linux on System z Advanced Technical Support IBM, Endicott, NY -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
We actually opened an issue with IBM over this. Here's what I got back: Action Taken...: The ethtool utility is not supported with all device drivers as noted in the man page. It's very typical that for an gigabit NIC (especially a fiber connection) will not have a valid speed reported or no speed reported at all. To some degree it makes a bit of sense as a gigabit card is exactly that, 1GB. That is you can't tell a 1GB FIBER card to run at 10MB. Granted what gets reported by ethtool (really what th device driver is returning is mis-leading). Here is another example .. a very simple Tigon3 GB NIC, note the speed it reported as Unknown! [EMAIL PROTECTED] ~]# ethtool eth0 Settings for eth0: Supported ports: [ FIBRE ] Supported link modes: 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 1000baseT/Half 1000baseT/Full Advertised auto-negotiation: Yes Speed: Unknown! (0) Duplex: Half Port: FIBRE mii-tool is only valid for mii compatable NIC cards. If the goal is to do some performance testing, then the best method is to use the netperf tools. ( see http://www.netperf.org) Another simple test is using dd and ftp, for example: # ftp hostname_of_server ftp bin ftp put | dd if=/dev/zero bs=32k count=1 /dev/null Using either of these tools should confirm that the NICS are transfering far faster the 10MB. So in other words, the gigabit OSA can only run at a gigabit, the tools are useless for this application, and the only way to be sure about the throughput is to measure it. -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Mark Post Sent: Monday, September 29, 2008 12:14 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] Gigabit interface on Linux? On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http
Re: Gigabit interface on Linux?
Thanks! That's very helpful to show this customer... appreciate you passing that on! Scott Rohling On Mon, Sep 29, 2008 at 10:51 AM, Hall, Ken (GTS) [EMAIL PROTECTED] wrote: We actually opened an issue with IBM over this. Here's what I got back: Action Taken...: The ethtool utility is not supported with all device drivers as noted in the man page. It's very typical that for an gigabit NIC (especially a fiber connection) will not have a valid speed reported or no speed reported at all. To some degree it makes a bit of sense as a gigabit card is exactly that, 1GB. That is you can't tell a 1GB FIBER card to run at 10MB. Granted what gets reported by ethtool (really what th device driver is returning is mis-leading). Here is another example .. a very simple Tigon3 GB NIC, note the speed it reported as Unknown! [EMAIL PROTECTED] ~]# ethtool eth0 Settings for eth0: Supported ports: [ FIBRE ] Supported link modes: 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 1000baseT/Half 1000baseT/Full Advertised auto-negotiation: Yes Speed: Unknown! (0) Duplex: Half Port: FIBRE mii-tool is only valid for mii compatable NIC cards. If the goal is to do some performance testing, then the best method is to use the netperf tools. ( see http://www.netperf.org) Another simple test is using dd and ftp, for example: # ftp hostname_of_server ftp bin ftp put | dd if=/dev/zero bs=32k count=1 /dev/null Using either of these tools should confirm that the NICS are transfering far faster the 10MB. So in other words, the gigabit OSA can only run at a gigabit, the tools are useless for this application, and the only way to be sure about the throughput is to measure it. -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Mark Post Sent: Monday, September 29, 2008 12:14 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] Gigabit interface on Linux? On 9/29/2008 at 12:02 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: On RHEL5.2 -- we're using mii-tools and seeing that the ethernet interface is set to 100mbs -- the OSA is set to gigabit - and we're wondering if something special needs to be done to set it to gigabit speeds.. Using 'ethtool=' doesn't seem to work on Linux (s390x linux).. I'm amazed that mii-tools returns anything at all. This is on a VSWITCH -- everything works fine except the reported speed... Any ideas? Since the interface that mii-tools is reporting on is a virtual one, having nothing to do with any real hardware, I would say ignore it. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
On 9/29/2008 at 12:39 PM, in message [EMAIL PROTECTED], Scott Rohling [EMAIL PROTECTED] wrote: Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... I suppose you could ask them what Xen and VMware guests report, and if that has any relation to the actual hardware in those boxes. I would have to believe not. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... I'd actually argue that ethtool is right -- there really isn't any valid number TO report. Reporting the actual physical interface speed would be wrong in that the memory speed interface isn't actually limited to that speed, and reporting the actual memory interface speed is wrong in that it's a theoretical number that you won't ever actually get. I guess my question is: why do they care? Does the application behave differently with different interface speeds, or is this one of those checkbox evals where must have gigE support is on there? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
They're just trying to confirm what they have.. and using the Linux tools they normally use to do so. I've since explained that a virtual NIC isn't going to show them the physical characteristics of the 'real' NIC and have explained that we've verified the OSA is set to gigabit speed. I guess you could equate it to the 'checkbox eval' -- someone from the app team got on and showed them what mii-tools what indicating and so they naturally started to ask questions or wonder if they needed to set something from the Linux side... Now that I've gotten all the good input, I'm better able to explain what they are seeing and why... Thanks again for all the great responses! Scott Rohling On Mon, Sep 29, 2008 at 11:11 AM, David Boyes [EMAIL PROTECTED] wrote: Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... I'd actually argue that ethtool is right -- there really isn't any valid number TO report. Reporting the actual physical interface speed would be wrong in that the memory speed interface isn't actually limited to that speed, and reporting the actual memory interface speed is wrong in that it's a theoretical number that you won't ever actually get. I guess my question is: why do they care? Does the application behave differently with different interface speeds, or is this one of those checkbox evals where must have gigE support is on there? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
Re: Gigabit interface on Linux?
This is pretty much the same situation we had. The SA's are used to the tools they know, so when they don't behave as expected on z, they get nervous. I've had questions about grub, netdump, EMC Powerpath, and Veritas VxVM. -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Scott Rohling Sent: Monday, September 29, 2008 2:13 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] Gigabit interface on Linux? They're just trying to confirm what they have.. and using the Linux tools they normally use to do so. I've since explained that a virtual NIC isn't going to show them the physical characteristics of the 'real' NIC and have explained that we've verified the OSA is set to gigabit speed. I guess you could equate it to the 'checkbox eval' -- someone from the app team got on and showed them what mii-tools what indicating and so they naturally started to ask questions or wonder if they needed to set something from the Linux side... Now that I've gotten all the good input, I'm better able to explain what they are seeing and why... Thanks again for all the great responses! Scott Rohling On Mon, Sep 29, 2008 at 11:11 AM, David Boyes [EMAIL PROTECTED] wrote: Thanks, Bruce -- we did that and confirmed it's set to gigabit.. but there seems to be concern from the Linux folks as mii-tools is reporting 100mbs and ethtool is not reporting anything... I'd actually argue that ethtool is right -- there really isn't any valid number TO report. Reporting the actual physical interface speed would be wrong in that the memory speed interface isn't actually limited to that speed, and reporting the actual memory interface speed is wrong in that it's a theoretical number that you won't ever actually get. I guess my question is: why do they care? Does the application behave differently with different interface speeds, or is this one of those checkbox evals where must have gigE support is on there? -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
