Date: Sat, 21 Oct 2006 11:39:09 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Mikhail Teterin <mi+kde@aldan.algebra.com> Cc: freebsdnic@mailbox.cps.intel.com, net@freebsd.org Subject: Re: 6.2 becomes unresponsive under high traffic Message-ID: <20061021153909.GA8705@xor.obsecurity.org> In-Reply-To: <200610211006.17003@aldan> References: <200610211006.17003@aldan>
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[-- Attachment #1 --] On Sat, Oct 21, 2006 at 10:06:16AM -0400, Mikhail Teterin wrote: > Hello! > > The system is a dual Opteron 244 running today's FreeBSD-6.2/amd64. > > em-interface connects it to the switch (in gigabit mode). > > When I direct 2 database dumps at the machine in parallel (the arriving data > is getting compressed and written to local disk), the "system" component of > the load (as reported by systat and top) goes up to 99-100% and stays there > for many minutes at a time. Accessing the box via console remains speedy, but > remote connections stall for minutes during which the box is not even > pingable... > > What appears to wake it up, though, is hitting a (local) keyboard button... > > Switching em0 to polling mode did not help... > > "netstat -m" does not show any rejections of buffer requests. > > It uses the BSD4-scheduler, as is the default. > > Earlier, in the single-CPU configuration, the box had no problems dealing with > such 2 data streams for hours, backing up all our databases. We added another > processor and updated the world/kernel from 6.1 to 6.2, hoping to halve the > dump times -- and it is barely crowling now... > > Please, advise. Thanks! We've been discussing em issues for several weeks now, so it would be great if you could get yourself up to speed - please review the discussion on freebsd-stable and freebsd-net (start with posts by Scott Long, myself, and Jack Vogel). Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFOj8cWry0BWjoQKURAt3BAJsEYU85MxxY/lz0urv/nNxUQCbjfgCfbwBo MS/kE/O/KWLBx7R+7+d0lcg= =jSAM -----END PGP SIGNATURE-----
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