Date: Sat, 15 Oct 2005 08:56:01 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Deepak Naidu <deepak_nai@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: Should I increase vfs.read_max Message-ID: <20051015135601.GB21223@dan.emsphone.com> In-Reply-To: <20051015070507.19793.qmail@web34609.mail.mud.yahoo.com> References: <20051015070507.19793.qmail@web34609.mail.mud.yahoo.com>
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In the last episode (Oct 15), Deepak Naidu said: > Hi, > I am running FreeBSD 5.4 on SunFire v20 on single > hard disk 73 GB... > > I googled down some links regarding increasing IO > performance. It said increase vfs.read_max from 8 to > 16. I have done that, but cant justify any > improvement, as I am running mailserver(spam checker). > Should I revert to 8 or use 16. Raising vfs.read_max is most helpful when you are reading large sequential files from RAID arrays. On a single-disk system, all it does is allow sequential readers to starve random readers. -- Dan Nelson dnelson@allantgroup.com
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