Date: Mon, 27 Apr 2009 12:27:27 -0400 From: Steve Polyack <korvus@comcast.net> To: Ghirai <ghirai@ghirai.com> Cc: freebsd-questions@freebsd.org Subject: Re: quick vfs tuning Message-ID: <49F5DCEF.4010208@comcast.net> In-Reply-To: <20090427191824.25e415e4.ghirai@ghirai.com> References: <20090427191824.25e415e4.ghirai@ghirai.com>
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Ghirai wrote: > The author suggested that increasing the default value of 8 to 16 > resulted in increased read speed, and that increasing it further > resulted in no noticeable performance gain. > > Personally, I've seen changes in vfs.read_max to provide anywhere from a 50-100% improvement in disk read performance. As you have also found, the "sweet spot" is sometimes higher than 16. I've seen significant benefits up to vfs.read_max=128 on *some* disk controllers. It really seems dependent on the disks/controllers, but setting 16 has always shown a significant improvement over the default 8 for me.
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