Date: Tue, 21 Feb 2006 19:27:22 +0000 (GMT) From: Nate Nielsen <nielsen-list@memberwebs.com> To: FreeLSD <freelsd@rea.mbslab.kiae.ru> Cc: hackers@freebsd.org Subject: Re: FreeBSD-6 and em interface speed Message-ID: <20060221192719.CD61EDCA992@mail.npubs.com> References: <20060221165456.GZ44603@rea.mbslab.kiae.ru>
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FreeLSD wrote: > Good day! > I've obtained the following strang results with the em Ethernet interface > speeds on a 6.1-PRERELEASE: > Polling on: > UDP stream to FreeBSD: 327843.84 Kbit/sec, > TCP stream to FreeBSD: 524550.12 Kbit/sec. > Polling off: > UDP stream to FreeBSD: 740409.38 Kbit/sec, > TCP stream to FreeBSD: 794348.44 Kbit/sec. Probably due to the test tool you're using. Does the tool serialize the UDP stream (ie: wait for a response for each packet)? In many cases polling will slow down an individual stream slightly, while upping the total throughput (hundreds of streams). In addition if your CPU and bus is fast enough to handle the interrupt rate (well behaved NICs mitigate interrupts) then polling will slow things down in most cases. BTW, this should go on freebsd-net. Cheers, Nate
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