Date: Wed, 05 Mar 2008 22:18:04 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Michael Grant <mg-fbsd3@grant.org> Cc: freebsd-stable@freebsd.org Subject: Re: swap_pager: indefinite wait buffer Message-ID: <47CF0E0C.70001@FreeBSD.org> In-Reply-To: <62b856460803051029v71f4adacia5f43cd3ecb66db3@mail.gmail.com> References: <62b856460803050106t4375c59aj586a8b48bf91f7de@mail.gmail.com> <E0FE2B62-F7EA-4D16-BE28-CD8E5703059E@verweg.com> <62b856460803051029v71f4adacia5f43cd3ecb66db3@mail.gmail.com>
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Michael Grant wrote: > On Wed, Mar 5, 2008 at 11:08 AM, Ruben van Staveren <ruben@verweg.com> wrote: >> On 5 Mar 2008, at 10:06, Michael Grant wrote: >> >> > My server just literally was brought to it's knees with this message >> > spewing on the console: >> > >> > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 1203133, size: >> > 4096 >> > >> > (blkno and size were varying) >> > >> > Some searching says that this is or was a bug. Has this been fixed >> > yet? If so, what should I upgrade to? I'm currently running 6.3 >> >> You may consider partition backed swap instead of file backed swap if >> that is the case. > > Hmm, I can't easily do that, I didn't leave any empty partitions > around as I never considered swapping to a file to be a so bad. > > Is swapping to a file so bad under normal conditions? The message indicates that it took >30 seconds to complete an operation, so it was timed out assuming the I/O was lost by the device. In your case it was probably not lost, just delayed for more than 30 seconds by an overloaded filesystem. > Does this mean that this bug is still not fixed in 7.0? It's not clear whether it's a bug or your disk is just too overloaded to complete the filesystem operation in a reasonable time period (swapping to a file is slower than swapping to a partition, which is already something you never want to do in normal operation). You can increase the timeout by editing the kernel. Kris
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