Re: openiscsi 10gbe network

On Tue, Nov 24, 2009 at 08:07:12AM -0800, Chris K. wrote: Hello, I'm writing in regards to the performance with open-iscsi on a 10gbe network. On your website you posted performance results indicating you reached read and write speeds of 450 MegaBytes per second. In our environment we

Re: iSCSI latency issue

Shachar f, on 11/25/2009 07:57 PM wrote: I'm running open-iscsi with scst on Broadcom 10Gig network and facing write latency issues. When using netperf over an idle network the latency for a single block round trip transfer is 30 usec and with open-iscsi it is 90-100 usec. I see that

Re: openiscsi 10gbe network

The dd command I am running is time dd if=/dev/zero bs=1024k of=/mnt/ iscsi/10gfile.txt count=10240 My fs is xfs (mkfs.xfs -d agcount=8 -l internal,size=128m -n size=8k - i size=2048 /dev/sdb1 -f) those are the parameters used to format the drive. Here are the top values: Cpu(s): 0.0%us,

iSCSI latency issue

I'm running open-iscsi with scst on Broadcom 10Gig network and facing write latency issues. When using netperf over an idle network the latency for a single block round trip transfer is 30 usec and with open-iscsi it is 90-100 usec. I see that Nagle (TCP_NODELAY) is disabled when openning socket

Re: openiscsi 10gbe network

Thank you for your response. The SAN is a 10gbe Nimbus with I believe to be iscsitarget(http://iscsitarget.sourceforge.net/) as it's target server. The switch is a Cisco Nexus5010 set to jumbo frame and flow control. We have through tcp/ip performance tests in conjunction with Cisco proved that

Re: openiscsi 10gbe network

Here is the dd command : time dd if=/dev/zero bs=1024k of=/mnt/iscsi/ 10gfile.txt count=10240 Here are the cpu values : Cpu(s): 0.0%us, 8.7%sy, 0.0%ni, 25.0%id, 64.0%wa, 0.4%hi, 1.9%si, 0.0%st - Client Cpu(s): 0.6%us, 2.8%sy, 0.0%ni, 86.4%id, 9.7%wa, 0.0%hi, 0.4%si, 0.0%st - SAN I

Re: !!!!Help: Problem when I login the iscsi hard disk

Ricky wrote: sda: got wrong page You mean this right? The linux scsi layer was trying to figure out the cache type. It got an unexpected answer and so ... sda: assuming drive cache: write through it used the default of write through cache. sd 6:0:0:0: Attached scsi disk sda sd 6:0:0:0:

Re: [Patch 1/2] iscsiadm: login_portal() misses outputting logs for iscsid_req_by_rec()

Yangkook Kim wrote: Thanks for your patch. I tested your patch and it worked fine. So, next you will upload this patch to the git tree and the patch will become the part of source code in the next release of open-iscsi. Is my understanding correct? Yeah. I merged it and uploaded it

Re: openiscsi 10gbe network

Boaz Harrosh wrote: On 11/24/2009 06:07 PM, Chris K. wrote: Hello, I'm writing in regards to the performance with open-iscsi on a 10gbe network. On your website you posted performance results indicating you reached read and write speeds of 450 MegaBytes per second. In our environment

Re: !!!!Help: Problem when I login the iscsi hard disk

This information will also come out when I fdisk /dev/sda. And I can not mkfs this disk. I think the cache type should be write back. But I do not how to handle this situation. 2009/11/26 Mike Christie micha...@cs.wisc.edu Ricky wrote: sda: got wrong page You mean this right? The linux

Re: [Scst-devel] iSCSI latency issue

On Wed, Nov 25, 2009 at 5:57 PM, Shachar f shacharf...@gmail.com wrote: I'm running open-iscsi with scst on Broadcom 10Gig network and facing write latency issues. When using netperf over an idle network the latency for a single block round trip transfer is 30 usec and with open-iscsi it is

Re: openiscsi 10gbe network

On 25 Nov 2009 at 14:15, Chris K. wrote: Here are the cpu values : Cpu(s): 0.0%us, 8.7%sy, 0.0%ni, 25.0%id, 64.0%wa, 0.4%hi, A note: I don't know how well open-iscsi uses multiple threads, but looking at individual CPUs may be interesting, as the above is only an average for multiple