From owner-cvs-all Fri Oct 12 13:46:55 2001 Delivered-To: cvs-all@freebsd.org Received: from silby.com (cb34181-a.mdsn1.wi.home.com [24.14.173.39]) by hub.freebsd.org (Postfix) with ESMTP id BB94F37B409 for ; Fri, 12 Oct 2001 13:46:46 -0700 (PDT) Received: (qmail 30525 invoked by uid 1000); 12 Oct 2001 20:46:44 -0000 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 12 Oct 2001 20:46:44 -0000 Date: Fri, 12 Oct 2001 15:46:44 -0500 (CDT) From: Mike Silbersack To: Matt Dillon Cc: , Subject: Re: cvs commit: src/sys/vm vnode_pager.c In-Reply-To: <200110122026.f9CKQMS35969@earth.backplane.com> Message-ID: <20011012154433.W29945-100000@achilles.silby.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 12 Oct 2001, Matt Dillon wrote: > :> Finally fix the VM bug where a file whos EOF occurs in the middle of a page > :> would sometimes prevent a dirty page from being cleaned, even when synced, > :> resulting in the dirty page being re-flushed to disk every 30-60 seconds or > :> so, forever. The problem is that when the filesystem flushes a page to > : > :How commonly did this occur? > : > :Mike "Silby" Silbersack > > In recent years the use of mmap() has increased hugely. For example, > 'cp', 'install', and 'tail' now use it, as does 'samba' and 'apache'. > I only know of one or two 'severe' cases. 99% of installations will > not be effected because they simply do not access a large enough number > of files or do not access files in a way that hits the bug for it to > become a problem. For example, my home system has been up 69 days > and not a single page is in this state. One of our production severs > with an uptime of 4 days has one page in this state. Another production > server up 185 days has 0 pages in this state. Ah. Ok, I was just wondering if this was a contributing factor to any of the various heavy load -> crash/freeze problems people occasionally report. Sounds like it probably isn't. Nonetheless, cool that it's fixed. :) Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message