Date: Wed, 24 Mar 2004 18:40:51 +0000 From: Colin Percival <colin.percival@wadham.ox.ac.uk> To: Sean Chittenden <seanc@FreeBSD.org> Cc: Jason Coene <jcoene@gotfrag.com> Subject: Re: cvs commit: src/sys/kern sysv_sem.c Message-ID: <6.0.1.1.1.20040324183111.043c2228@imap.sfu.ca> In-Reply-To: <D39C9A62-7DBB-11D8-B2DF-000A95C705DC@FreeBSD.org> References: <200403170937.i2H9bDvO033177@repoman.freebsd.org> <D39C9A62-7DBB-11D8-B2DF-000A95C705DC@FreeBSD.org>
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At 17:51 24/03/2004, Sean Chittenden wrote: >> FreeBSD src repository >> >> Modified files: >> sys/kern sysv_sem.c >> Log: >> Adjust the number of processes waiting on a semaphore properly if we're >> woken up in the middle of sleeping. > >Have you read the thread on performance@ regarding semaphore performance problems for PostgreSQL? Do you think this has any bearing on that problem? -sc I hadn't seen the thread on performance@ until now, but it sounds like this is very likely related -- this bug would result in processes not being woken up when a semaphore becomes free. Jason, could you update your src/sys/kern/sysv_sem.c to the latest revision (1.69), build a new kernel, and see if the problem goes away? Colin Percival
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