Hi, On 11/06/2014 06:15 AM, Ronciak, John wrote: > Julia, > > First we can't help you with your Realtec issue. Not our driver. > > The only time when you'll notice actual pauses in traffic due to XON/XOFF > will be when the link is saturated to the point where packets would be > dropped with the HW (on the end that is XON/XOFF enabled). So in using ping > it would be doubtful that you would ever be in a situation where packets > would be dropped. >
Ping was suggested in [1] as a test for whether it's working. I also tried saturating the link with UDP packets in the setup with 2 physical machines where the link speed was set to 10 Mbps. I used iperf for this purpose, started the transmission from first to second machine, and simulaneously used the tool from [1] to generate a couple of pause frames at arbitrary times on the second machine. I captured the traffic at the second machine and considered the timestamps. According to the standard, the network adapter pauses the transmission completely on the reception of a pause frame for the time specified. Therefore I would expect to see noticeable variations in the intervals between consecutive packets at the time when I generated the pause frames. However there were no significant variations to be seen. Regards, Julia Niewiejska [1] http://www.tux.org/pub/sites/www.zip.com.au/%257Eakpm/linux/#flow-ctrl > Im not sure where you ae going with this. Do you not believe that packets > are being paused to the correct amount of time due the XON/XOFF settings? > Also, you should be trying to use a connection to a switch port that is > enabled for XON/XOFF. I think no matter how you are going to test this you > will need to use something like pktgen or other type of packet generator to > generate enough traffic to saturate the link enough for XON/XOFF to engage. > > Cheers, > John > >> -----Original Message----- >> From: Julia Niewiejska [mailto:julia.niewiej...@fkie.fraunhofer.de] >> Sent: Wednesday, November 5, 2014 12:19 AM >> To: e1000-devel@lists.sourceforge.net >> Subject: [E1000-devel] 802.3x pause frames >> >> Hello, >> >> I indend to do some experiments with 802.3x pause frames, but I have yet to >> find a setup that works. I used a tool that generates pause frames [1] in two >> setups. First one consists of two virtual machines on a VMWare ESXi 5.5 >> server connected with each other through a virtual switch. In second setup >> two physical machines (Desktop PCs) were connected directly by an ethernet >> cable. The VMs are running Debian Wheezy 32bit while Debian Testing >> (Jessie) 64bit is installed on both desktop PCs. Below you will find some >> information on the ethernet adapters and drivers used in the VM [2], the >> desktop PC with the more up to date hardware [3] and the older machine >> [4]. I used the following command to activate flow control: >> >> ethtool -A <eth> autoneg off rx on tx on >> >> First of all I noticed some discrepancies between the output of mii-tools or >> ethtool -a and the attempt to change the flow control settings with the >> command above. Only the Realtek adapter actually output that it didn't >> support the operation, the other adapters accepted the settings without any >> error message. >> >> In both setups pause frames were generated on one machine while a ping >> was sent simultaneously, as suggested in [1]. While the VM connection was >> set to 1 Gbps the whole time, I also tested a 10 Mbps setting on the physical >> connection. Even though the pause frames were always visible in tcpdump at >> the receiver, I didn't notice any influence whatsoever in the ping results. >> >> Did I miss some important settings that activate pause frame support, or is >> it >> possible that none of those different ethernet adapters and modules that >> were tested support at least the reception of pause frames? >> If so, are there any adapters that do support them? I'm also not sure how to >> interpret the output of ethtool. E.g. what does "Advertised pause frame >> use" mean, exactly? >> >> >> Many thanks. >> >> Julia Niewiejska >> >> >> [1] >> http://www.tux.org/pub/sites/www.zip.com.au/%257Eakpm/linux/#flow- >> ctrl >> >> >> ---------------------------------------------- >> [2] Virtual machine on VMWare ESXi 5.5: Debian Wheezy 32bit, kernel 3.2 >> >> *** lspci -v *** >> >> 02:02.0 Ethernet controller: Intel Corporation 82545EM Gigabit Ethernet >> Controller (Copper) (rev 01) >> Subsystem: VMware PRO/1000 MT Single Port Adapter >> Physical Slot: 34 >> Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 16 >> Memory at fd5a0000 (64-bit, non-prefetchable) [size=128K] >> Memory at fdfe0000 (64-bit, non-prefetchable) [size=64K] >> I/O ports at 2040 [size=64] >> [virtual] Expansion ROM at ebb10000 [disabled] [size=64K] >> Capabilities: [dc] Power Management version 2 >> Capabilities: [e4] PCI-X non-bridge device >> Kernel driver in use: e1000 >> >> >> *** mii-tool -v *** >> >> eth1: negotiated 1000baseT-FD flow-control, link ok >> product info: Yukon 88E1011 rev 3 >> basic mode: autonegotiation enabled >> basic status: autonegotiation complete, link ok >> capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD >> advertising: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD >> 10baseT-FD 10baseT-HD >> link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD >> >> >> >> *** ethtool eth1 *** >> >> Settings for eth1: >> Supported ports: [ TP ] >> Supported link modes: 10baseT/Half 10baseT/Full >> 100baseT/Half 100baseT/Full >> 1000baseT/Full >> Supported pause frame use: No >> Supports auto-negotiation: Yes >> Advertised link modes: 10baseT/Half 10baseT/Full >> 100baseT/Half 100baseT/Full >> 1000baseT/Full >> Advertised pause frame use: No >> Advertised auto-negotiation: Yes >> Speed: 1000Mb/s >> Duplex: Full >> Port: Twisted Pair >> PHYAD: 0 >> Transceiver: internal >> Auto-negotiation: on >> MDI-X: Unknown >> Supports Wake-on: d >> Wake-on: d >> Current message level: 0x00000007 (7) >> drv probe link >> Link detected: yes >> >> *** ethtool -a eth1 *** >> >> Pause parameters for eth1: >> Autonegotiate: on >> RX: off >> TX: off >> >> ---------------------------------------------- >> [3] Desktop PC 1: Debian Jessie 64bit, kernel 3.16 >> >> *** lspci -v *** >> >> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. >> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c) >> Subsystem: ASUSTeK Computer Inc. Device 8554 >> Flags: bus master, fast devsel, latency 0, IRQ 44 >> I/O ports at d000 [size=256] >> Memory at f7100000 (64-bit, non-prefetchable) [size=4K] >> Memory at f2100000 (64-bit, prefetchable) [size=16K] >> Capabilities: [40] Power Management version 3 >> Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+ >> Capabilities: [70] Express Endpoint, MSI 01 >> Capabilities: [b0] MSI-X: Enable- Count=4 Masked- >> Capabilities: [d0] Vital Product Data >> Capabilities: [100] Advanced Error Reporting >> Capabilities: [140] Virtual Channel >> Capabilities: [160] Device Serial Number 01-00-00-00-68-4c-e0-00 >> Capabilities: [170] Latency Tolerance Reporting >> Kernel driver in use: r8169 >> >> *** mii-tool -v *** >> >> eth0: negotiated 1000baseT-FD flow-control, link ok >> product info: vendor 00:07:32, model 0 rev 0 >> basic mode: autonegotiation enabled >> basic status: autonegotiation complete, link ok >> capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD >> advertising: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD >> 10baseT-FD 10baseT-HD flow-control >> link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD flow-control >> >> *** ethtool eth0 *** >> >> Settings for eth0: >> Supported ports: [ TP MII ] >> Supported link modes: 10baseT/Half 10baseT/Full >> 100baseT/Half 100baseT/Full >> 1000baseT/Half 1000baseT/Full >> >> Supported pause frame use: No >> >> Supports auto-negotiation: Yes >> >> Advertised link modes: 10baseT/Half 10baseT/Full >> >> 100baseT/Half 100baseT/Full >> >> 1000baseT/Full >> >> Advertised pause frame use: Symmetric Receive-only >> >> Advertised auto-negotiation: Yes >> >> Link partner advertised link modes: 10baseT/Half 10baseT/Full >> >> 100baseT/Half >> 100baseT/Full >> 1000baseT/Half >> 1000baseT/Full >> Link partner advertised pause frame use: Symmetric Receive-only >> >> Link partner advertised auto-negotiation: Yes >> >> Speed: 1000Mb/s >> >> Duplex: Full >> >> Port: MII >> >> PHYAD: 0 >> >> Transceiver: internal >> >> Auto-negotiation: on >> >> Supports Wake-on: pumbg >> >> Wake-on: g >> >> Current message level: 0x00000033 (51) >> >> drv probe ifdown ifup >> >> Link detected: yes >> >> *** ethtool -a eth0 *** >> >> Pause parameters for eth0: >> Cannot get device pause settings: Operation not supported >> >> >> ---------------------------------------------- >> [4] Desktop PC 2: Debian Jessie 64bit, kernel 3.16 >> >> *** lspci -v *** >> >> 00:19.0 Ethernet controller: Intel Corporation 82578DM Gigabit Network >> Connection (rev 05) >> Subsystem: Hewlett-Packard Company Device 304b >> >> Flags: bus master, fast devsel, latency 0, IRQ 43 >> >> Memory at f0400000 (32-bit, non-prefetchable) [size=128K] >> Memory at f0425000 (32-bit, non-prefetchable) [size=4K] >> I/O ports at 2100 [size=32] >> Capabilities: [c8] Power Management version 2 >> Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+ >> Capabilities: [e0] PCI Advanced Features >> Kernel driver in use: e1000e >> >> *** mii-tool -v *** >> >> eth1: negotiated 1000baseT-FD flow-control, link ok >> product info: vendor 00:13:74, model 4 rev 0 >> basic mode: autonegotiation enabled >> basic status: autonegotiation complete, link ok >> capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD >> advertising: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD flow-control >> link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD >> 10baseT-HD flow-control >> >> *** ethtool eth1 *** >> >> Settings for eth1: >> Supported ports: [ TP ] >> Supported link modes: 10baseT/Half 10baseT/Full >> 100baseT/Half 100baseT/Full >> 1000baseT/Full >> Supported pause frame use: No >> Supports auto-negotiation: Yes >> Advertised link modes: 10baseT/Half 10baseT/Full >> 100baseT/Half 100baseT/Full >> 1000baseT/Full >> Advertised pause frame use: No >> Advertised auto-negotiation: Yes >> Speed: 1000Mb/s >> Duplex: Full >> Port: Twisted Pair >> PHYAD: 2 >> Transceiver: internal >> Auto-negotiation: on >> MDI-X: off (auto) >> Supports Wake-on: pumbg >> Wake-on: g >> Current message level: 0x00000007 (7) >> drv probe link >> Link detected: yes >> >> *** ethtool -a eth1 *** >> >> Pause parameters for eth1: >> Autonegotiate: on >> RX: on >> TX: off >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> E1000-devel mailing list >> E1000-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/e1000-devel >> To learn more about Intel® Ethernet, visit >> http://communities.intel.com/community/wired -- Dipl.-Inform. Julia Niewiejska Kommunikationssysteme (KOM) Fraunhofer-Institut für Kommunikation, Informationsverarbeitung und Ergonomie FKIE Fraunhoferstraße 20 D-53343 Wachtberg Tel.: +49 (0)228 9435-609 Mail: julia.niewiej...@fkie.fraunhofer.de http://www.fkie.fraunhofer.de ------------------------------------------------------------------------------ _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
