Date: Mon, 25 Jan 2010 10:22:57 -0800 From: Pyun YongHyeon <pyunyh@gmail.com> To: Nick Rogers <ncrogers@gmail.com> Cc: Jason Chambers <jchambers@ucla.edu>, "stable@freebsd.org" <stable@freebsd.org>, "jfvogel@gmail.com" <jfvogel@gmail.com>, Lars Eggert <lars.eggert@nokia.com> Subject: Re: em interface slow down on 8.0R Message-ID: <20100125182257.GG1187@michelle.cdnetworks.com> In-Reply-To: <147432021001250825p202914a7ka5a2c1d28d96bac3@mail.gmail.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> <147432021001250825p202914a7ka5a2c1d28d96bac3@mail.gmail.com>
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On Mon, Jan 25, 2010 at 08:25:43AM -0800, Nick Rogers wrote: > 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'm not sure you're seeing a checksum offload bug of em(4) but the bug is easily reproducible in VLAN environments. If the issue is gone when you disable TX checksum offloading, see kern/141843 for for more detailed information as well as fix. > 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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