Date: Sun, 02 Oct 2005 17:47:09 -0500 From: Matt Hartzell <mchartzell@getdts.com> To: Robert Lindgren <robert@orcafat.com> Cc: freebsd-smp@freebsd.org Subject: Re: FreeBSD 5.4 network performance with SMP Message-ID: <4340636D.3090408@getdts.com> In-Reply-To: <200510022209.38594.robert@orcafat.com> References: <200510022209.38594.robert@orcafat.com>
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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. Also, what sysctl settings are you using? If your network supports it, how about using jumbo frames? 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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