On Tuesday 04 May 2004 03:55 pm, Gerrit Nagelhout wrote: > Hi, > > For one of our applications in our testlab, we are running bridge(4) > with several user land applications. I have found that the bridging > performance (64 byte packets, 2-port bridge) on 5.2.1 is > significantly lower than that of RELENG_4, especially when running in > SMP. The platform is a dual 2.8GHz xeon with a dual port em (100MHz > PCI-X). Invariants are disabled, and polling (with idle_polling > enabled) is used. Well, I do have a patch you can try but I am unsure if it will help or not. Basically, the new interrupt code in 5.2 has a bug that can really hurt interrupt latency when doing kernel-intensive tasks. Since you are using polling it may not help much, but it's still something you can try. The patch should apply to 5.2.1 just fine. http://www.FreeBSD.org/~jhb/patches/ithread_preempt.patch -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.orgReceived on Fri May 14 2004 - 09:48:23 UTC
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