Date: Mon, 3 Oct 2005 09:39:18 +0200 From: Robert Lindgren <robert@orcafat.com> To: Undisclosed.Recipients: ; Cc: freebsd-smp@freebsd.org Subject: Re: FreeBSD 5.4 network performance with SMP Message-ID: <200510030939.18882.robert@orcafat.com> In-Reply-To: <4340636D.3090408@getdts.com> References: <200510022209.38594.robert@orcafat.com> <4340636D.3090408@getdts.com>
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On Monday 03 October 2005 00:47, Matt Hartzell wrote: > In my experience I had to disable the USB in the bios. > > Do a quick vmstat -i and note how many interrupts are on the uhci > device - with no devices even connected to the usb bus. uhci isn't loaded. It's not comipiled in my kernels at all. > > Also, what sysctl settings are you using? I use the standard settings. > > If your network supports it, how about using jumbo frames? We would I do that? It works OK with a UP kernel, so why should I need to use jumbo frames on a SMP kernel? I've never had to do that on 4.11 for example and I'm confident that jumbo frames won't help me at all. > > Robert Lindgren wrote: > >Hi All, > > > >I have a strange little problem on Dell 1800's. If HT,SMP is enabled in > > the kernel (5.4p7), performance on the integrated em0 is not especially > > good, half the speed of the current 100Mbit connection. This is true from > > the server and a little better to the server. On a pci rl0 card in the > > same machine performance is even worse. About 15Mbit from the server! > > > >Then I read a lot of people having poor performance from the rl0 cards and > > a lot of FreeBSD people bashing it for being crap, even in the source > > code for the module it's stated that these cards aren't so good. I guess > > that is right to some extent but not 15Mbit/sec. > > > >So when I rebuilt the kernel without HT and SMP I get full wirespeed from > > the em0 and the rl0 (100Mbit/sec). Is there anything I've been doing > > wrong to get hit by this poor performance with the SMP kernel. I read the > > disabling USB could improve performance but tried that with the HT kernel > > without any luck. > > > >The server has 1 3Ghz cpu, and I would prefer too run a HT enabled kernel, > > but not with that kind of performance, so please advice. The same > > machines (Dell 1800) run linux with HT enabled without any network > > performance degradation. > > > >Best regards > >Robert Lindgren > > > >_______________________________________________ > >freebsd-smp@freebsd.org mailing list > >http://lists.freebsd.org/mailman/listinfo/freebsd-smp > >To unsubscribe, send any mail to "freebsd-smp-unsubscribe@freebsd.org"
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