Date: Mon, 23 Aug 2010 11:55:40 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: ZFS performance question Message-ID: <i4tgip$bv9$1@dough.gmane.org> In-Reply-To: <EDFF110C-91D3-40DA-A581-9885EAAE3753@ant.uni-bremen.de> References: <EDFF110C-91D3-40DA-A581-9885EAAE3753@ant.uni-bremen.de>
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On 08/20/10 12:30, Heinrich Rebehn wrote: > I am somewhat concerned about the numbers for per-char-output and per-char-input. In fact, i have never before seen that low numbers in a bonnie test. Using a single disk with UFS yields about 6 times as much. > > BTW: Running OpenSolaris on the same hardware yields 110306 for per-char-write and 94698 for per-char-read. "per-char" stats are different between different operating systems because of how they are implemented. Apparently, bonnie++ forces full disk writes (fsyncs) for each byte written on BSDs, but Linux (and apparently Solaris) somehow manage to write-cache this (or at least - cache it much more). It only matters if you have software which depends on this caching and performs slowly otherwise.
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