Messages in this thread | | | Date | Thu, 07 Feb 2008 08:58:19 -0800 | From | Max Krasnyansky <> | Subject | Re: e1000 1sec latency problem |
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Pavel Machek wrote: > Hi! > > I have the famous e1000 latency problems: > > 64 bytes from 195.113.31.123: icmp_seq=68 ttl=56 time=351.9 ms > 64 bytes from 195.113.31.123: icmp_seq=69 ttl=56 time=209.2 ms > 64 bytes from 195.113.31.123: icmp_seq=70 ttl=56 time=1004.1 ms > 64 bytes from 195.113.31.123: icmp_seq=71 ttl=56 time=308.9 ms > 64 bytes from 195.113.31.123: icmp_seq=72 ttl=56 time=305.4 ms > 64 bytes from 195.113.31.123: icmp_seq=73 ttl=56 time=9.8 ms > 64 bytes from 195.113.31.123: icmp_seq=74 ttl=56 time=3.7 ms > > ...and they are still there in 2.6.25-git0. I had ethernet EEPROM > checksum problems, which I fixed by the update, but problems are not > gone. > > irqpoll helps. > > nosmp (which implies XT-PIC is being used) does not help. > > 16: 1925 0 IO-APIC-fasteoi ahci, yenta, uhci_hcd:usb2, eth0 > > Booting kernel with nosmp/ no yenta, no usb does not help. > > Hmm, as expected, interrupt load on ahci (find /) makes latencies go > away. > > It should be easily reproducible on x60 with latest bios, it is 100% > reproducible for me...
So you don't think it's related to the interrupt coalescing by any chance ? I'd suggest to try and disable the coalescing and see if it makes any difference. We've had lots of issues with coalescing misbehavior. Not this bad (ie 1 second) though.
Add this to modprobe.conf and reload e1000 module
options e1000 RxIntDelay=0,0 RxAbsIntDelay=0,0 InterruptThrottleRate=0,0 TxIntDelay=0,0 TxAbsIntDelay=0,0
Max
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