Date: Mon, 25 Jan 2010 08:25:43 -0800 From: Nick Rogers <ncrogers@gmail.com> To: Lars Eggert <lars.eggert@nokia.com> Cc: Jason Chambers <jchambers@ucla.edu>, "stable@freebsd.org" <stable@freebsd.org>, "jfvogel@gmail.com" <jfvogel@gmail.com> Subject: Re: em interface slow down on 8.0R Message-ID: <147432021001250825p202914a7ka5a2c1d28d96bac3@mail.gmail.com> In-Reply-To: <95D3CB82-BC44-491D-86E4-5CB82F89C0FC@nokia.com> References: <20091201.102925.218343479.hrs@allbsd.org> <2a41acea0912021249w1aed8e83kf89ceb1e6041edaf@mail.gmail.com> <2a41acea0912021514r2d44dd33n4c364518d7fe1703@mail.gmail.com> <20091203.182931.129751456.hrs@allbsd.org> <4B43F6EE.3010308@ucla.edu> <147432021001242047k659a26d0s44b35164920aeb74@mail.gmail.com> <95D3CB82-BC44-491D-86E4-5CB82F89C0FC@nokia.com>
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I have not tried toying with any tcp sysctl. I'm not having performance problems so much as the interface just stops working entirely, which I would think has nothing to do with the TCP stack when layer 2 is not functioning? I'll give it a shot if I can. For the moment I have had to switch to a different (lower performance) network card to get things stable and I would like to be aware of a more concrete driver fix in STABLE before switching back my production machines. On Mon, Jan 25, 2010 at 6:25 AM, Lars Eggert <lars.eggert@nokia.com> wrote: > Hi, > > have you tried turning off TCP Segmentation Offloading (net.inet.tcp.tso > sysctl)? That fixed performance issues with some em cards for me. > > Lars > >
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