Re: cvs commit: src/sys/kern sysv_sem.c
From: Colin Percival (colin.percival_at_wadham.ox.ac.uk)
Date: 03/24/04
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Date: Wed, 24 Mar 2004 18:40:51 +0000 To: Sean Chittenden <seanc@FreeBSD.org>
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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