Date: Sun, 21 Sep 2014 01:00:30 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 193802] New: tso seems broken on RELENG10 for version 7.4.2 of em driver Message-ID: <bug-193802-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193802 Bug ID: 193802 Summary: tso seems broken on RELENG10 for version 7.4.2 of em driver Product: Base System Version: 10.0-STABLE Hardware: amd64 OS: Any Status: Needs Triage Severity: Affects Many People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: mike@sentex.net The latest version of the em driver seems to have broken tso support. When using default nfs mount options, the client's nic will wedge and throw watchdog errors. Reverting to the previous version of em, or disabling tso works around the issue. The bug seems to effect at least two variants of the NIC vendor = 'Intel Corporation' device = '82574L Gigabit Network Connection' class = network and em0 at pci0:0:25:0: class=0x020000 card=0x34ec8086 chip=0x10ef8086 rev=0x05 hdr=0x00 vendor = 'Intel Corporation' device = '82578DM Gigabit Network Connection' More discussion can be found in http://lists.freebsd.org/pipermail/freebsd-stable/2014-September/080081.html To recreate the issue, on the nfs client mount an nfs share with default options. In my test case, it was a RELENG10 box with igb nics acting as the server generate a number of tcp streams over the share. running these two scripts at the same time will wedge the client nic in less then a few minutes #!/bin/sh while true do dd if=/dev/urandom ibs=64k count=1000 | pbzip2 -c -p3 > /mnt/test.bz2 dd if=/dev/urandom ibs=63k count=1000 | pbzip2 -c -p3 > /mnt/test.bz2 dd if=/dev/urandom ibs=66k count=1000 | pbzip2 -c -p3 > /mnt/test.bz2 done root at backup3:/usr/home/mdtancsa # cat i3 #!/bin/sh while true do dd if=/dev/zero of=/mnt/test2 bs=128k count=2000 sleep 10 done When wedged, the NIC shows Interface is RUNNING and ACTIVE em1: hw tdh = 343, hw tdt = 838 em1: hw rdh = 512, hw rdt = 511 em1: Tx Queue Status = 1 em1: TX descriptors avail = 516 em1: Tx Descriptors avail failure = 1 em1: RX discarded packets = 0 em1: RX Next to Check = 512 em1: RX Next to Refresh = 511 Occasionally, this error message will show up em0: Watchdog timeout -- resetting em0: Queue(0) tdh = 349, hw tdt = 176 em0: TX(0) desc avail = 173,Next TX to Clean = 349 em0: link state changed to DOWN em0: link state changed to UP At this point, ifconfig em0 down;ifconfig em0 up needs to be done. work around is either to revert to the previous version of the driver, or ifconfig em0 -tso FreeBSD 10.1-BETA1 #10 r271466 on an Intel MB S3420GP Latest BIOS Version: S3420GP.86B.01.00.0052.051620141338 Also tested on an AMD MB with a PCI-E NIC -- You are receiving this mail because: You are the assignee for the bug.
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