Date: Thu, 09 Nov 2006 14:02:58 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-stable@freebsd.org Subject: Re: Dissapointing performance of ciss RAID 0+1 ? Message-ID: <eiv8u2$pf$1@sea.gmane.org> In-Reply-To: <E1Gi8I0-0006I7-Dk@dilbert.firstcallgroup.co.uk> References: <45528C16.5030100@paradise.net.nz> <E1Gi8I0-0006I7-Dk@dilbert.firstcallgroup.co.uk>
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Pete French wrote: >> You might be able to speed up the read by playing with the vfs.read_max >> sysctl (try 16 or 32). > > Wow! That makes a huge difference, thanks. Should this not be in 'man tuning' ? AFAIK vfs.read_max will only influence sequential reading - it's the readahead size. Also, it's still unexplained how increasing it yields performance better than that of 'dd' on a raw device.
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