Date: Tue, 26 Jan 2010 23:16:30 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: em interface slow down on 8.0R Message-ID: <20100127071630.GA69403@icarus.home.lan> In-Reply-To: <147432021001262309l47ac1a1bsf08c70a9335c887b@mail.gmail.com> References: <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> <20100125182257.GG1187@michelle.cdnetworks.com> <147432021001251038r69393ab3m1a797e58f9fa905a@mail.gmail.com> <02307620-ECDC-4E8B-A5B1-FF8491E226C4@nokia.com> <33c6b0bc1001252031k508426bfh25fad65e9223d87@mail.gmail.com> <147432021001262309l47ac1a1bsf08c70a9335c887b@mail.gmail.com>
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On Tue, Jan 26, 2010 at 11:09:45PM -0800, Nick Rogers wrote: > Can anyone clarify if I should be looking to disable TSO or TXCSUM, or both, > or does disabling either one somehow work around the problem? Thanks a lot. > > On Mon, Jan 25, 2010 at 8:31 PM, Joshua Boyd <boydjd@jbip.net> wrote: > > > I've been having a similar problem with my network dropping completely on > > my > > 8-STABLE gateway/firewall/fileserver. My setup is a little different, as I > > have re0 and ral0 bridged for LAN, and em0 for WAN. I've just turned off TX > > checksum offloading to see if that makes any difference. > > > > On Mon, Jan 25, 2010 at 1:49 PM, Lars Eggert <lars.eggert@nokia.com> > > wrote: > > > > > Hi, > > > > > > On 2010-1-25, at 19:38, Nick Rogers wrote: > > > >> On Mon, Jan 25, 2010 at 10:22 AM, Pyun YongHyeon <pyunyh@gmail.com> > > > wrote: > > > >> 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. > > > >> > > > > Good to know, but I am having a similar problem on another em(4) > > > interface that has no VLAN interfaces. > > > > > > FYI, I also have these issues without using VLANs, and turning off TSO > > > fixed them. The recommendation is to disable TSO (TCP Segmentation Offloading) as well as TXCSUM (TCP Checksum Offloading). -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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