Max Krasnyansky wrote: > 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
that can't be the problem. irq moderation would only account for 2-3ms variance maximum. Pavel, can you send me the `lspci -vvv` of your machine with the very latest git tree and after it's showing the poor ping performance? Auke -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
