Date: Sun, 14 Aug 2005 02:16:57 -0700 From: Ade Lovett <ade@FreeBSD.org> To: Ade Lovett <ade@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: Serious performance issues, broken initialization, and a likely fix Message-ID: <42FF0C09.2070204@FreeBSD.org> In-Reply-To: <42F7D104.2020103@FreeBSD.org> References: <42F7D104.2020103@FreeBSD.org>
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Ade Lovett wrote: > To cut a long story short, the order in which nswbuf is being > initialized is completely, totally, and utterly wrong -- this was > introduced by revision 1.132 of vm/vnode_pager.c just over 4 years ago. This is now logged as kern/84903 and, as the PR states, IMO 6.0 should *NOT* be released until a resolution is found to this problem. The current misinitialization of nswbuf will affect *any* system where there are even a reasonable number of attempted concurrent disk reads. I'm certainly willing to work with someone to get a definitive patch made, however we do *not* run HEAD here, only RELENG_6, so that will have to be taken into consideration. -aDe
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