Date: Fri, 19 Nov 2004 17:57:46 +0100 From: sthaug@nethelp.no To: Emanuel.Strobl@gmx.net Cc: freebsd-stable@freebsd.org Subject: Re: serious networking (em) performance (ggate and NFS) problem Message-ID: <79374.1100883466@bizet.nethelp.no> In-Reply-To: Your message of "Fri, 19 Nov 2004 13:18:40 %2B0100" References: <200411191318.46405.Emanuel.Strobl@gmx.net>
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> I changed cables and couldn't reproduce that bad results so I changed cables > back but also cannot reproduce them, especially the ggate write, formerly > with 2,6MB/s now performs at 15MB/s, but I haven't done any polling tests > anymore, just interrupt driven, since Matt explained that em doesn't benefit > of polling in any way. > > Results don't indicate a serious problem now but are still about a third of > what I'd expected with my hardware. Do I really need Gigahertz Class CPUs to > transfer 30MB/s over GbE? I would be highly surprised if you did. When I tested this a while ago (around FreeBSD 4.8) with a pair of Intel ISP 1100 1U servers using Pentium 700 and Intel GigE cards (em driver), I was able to get around 700 Mbps using ttcp. This was done with a normal 32 bit 33 MHz PCI bus. Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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