Date: Wed, 26 Dec 2007 15:33:08 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Mark Fullmer <maf@splintered.net> Cc: Kostik Belousov <kostikbel@gmail.com>, freebsd-net@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Packet loss every 30.999 seconds Message-ID: <47726624.6020805@FreeBSD.org> In-Reply-To: <A5B963DF-2E33-41B2-AD5A-61A9FE7903C2@splintered.net> References: <20071221234347.GS25053@tnn.dglawrence.com> <MDEHLPKNGKAHNMBLJOLKMEKLJAAC.davids@webmaster.com> <20071222050743.GP57756@deviant.kiev.zoral.com.ua> <20071223032944.G48303@delplex.bde.org> <20071222201613.GX57756@deviant.kiev.zoral.com.ua> <20071223095314.G1323@delplex.bde.org> <20071224131906.GB57756@deviant.kiev.zoral.com.ua> <833223E8-B1ED-4358-A992-F3789E4B3070@splintered.net> <20071225052749.GE57756@deviant.kiev.zoral.com.ua> <A5B963DF-2E33-41B2-AD5A-61A9FE7903C2@splintered.net>
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Mark Fullmer wrote: > > On Dec 25, 2007, at 12:27 AM, Kostik Belousov wrote: > >> >> What fs do you use ? If FFS, are softupdates turned on ? Please, show the >> total time spent in the softdepflush process. >> >> Also, try to add the FULL_PREEMPTION kernel config option and report >> whether it helps. > > FFS with soft updates on all filesystems. > > With your latest uio_yield() in MNT_VNODE_FOREACH patch it's a > little harder to provoke packet loss. Standard nightly > crontabs and a tar -cf - / > /dev/null no longer cause drops. A > make buildkernel will though. > > root 38 0.0 0.0 0 8 ?? DL Mon08PM 0:04.62 > [softdepflush] > > Building a new kernel with KTR and FULL_PREEMPTION now. FYI FULL_PREEMPTION causes performance loss in other situations. Kris
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