Messages in this thread | | | Date | Tue, 18 Sep 2007 10:28:43 -0400 | From | Bill Davidsen <> | Subject | Re: PROBLEM: Network sky2 Module |
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ben soo wrote: > i'm experiencing this problem myself. i have 2 servers, one using > X86_64 kernel version 2.6.23-rc5 on a 100Mbit network and one with i386 > kernel version 2.6.23-rc6 on a 1Gbit network. > > They both have this issue with the sky2 network device driver whereby > the device would stop working and need to be brought down and back up. > > On the X86_64 kernel on a 100Mbit network, this is a very occasional > thing, while on the i386 kernel on a 1Gbit network the device only works > for a few minutes at a time. If i set the MTU to 7200 then the device > seems to stay functional, but then i see long delays when it's talking > to 100Mbit devices with standard 1500 MTU that are outside of its LAN > segment. > > This last might be an artifact caused by the firewall, i dunno. > Yes, I have found that I get far less problem in this area leaving the MTU at 1500, then putting a larger MTU (usually 9000) into the routing table for segments, or even just machines, where I know there is direct connectivity. I use 9000 MTU with my directly connected file server, 1500 elsewhere. I can go to 9000 for nbd servers as well, assuming the connection doesn't pass a firewall.
I have some hints that while the switches I use will speak 10/100/1000 between machines with different speeds, and will handle jumbo packets between machines at the same speed, if I'm going Gbit/jumbo to 1500/slower performance seems to suffer more than talking smaller packets. That may be because window size needs to be even larger or something.
I have some legacy machines talking 10Mbit/half on 10base2 cable, I may be seeing more of this than the average site. That's legacy as in "attached to something expensive to replace."
-- Bill Davidsen <davidsen@tmr.com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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