Date: Sat, 22 Jan 2011 17:27:14 +0000 From: Bruce Cran <bruce@cran.org.uk> To: Karl Pielorz <kpielorz_lst@tdx.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: Write cache, is write cache, is write cache? Message-ID: <20110122172714.00002274@unknown> In-Reply-To: <D8077758CFED5EF1CB2AB613@Octa64> References: <1ABA88EDF84B6472579216FE@Octa64> <20110122111045.GA59117@icarus.home.lan> <D8077758CFED5EF1CB2AB613@Octa64>
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On Sat, 22 Jan 2011 15:51:21 +0000 Karl Pielorz <kpielorz_lst@tdx.co.uk> wrote: > I'll have a look at those - I'm more interested in finding a tool > that will write data both with, and without the "don't cache this" > flag(s) set - to see if the performance is the same (you would hope > that regardless of the BIOS setting that writing entirely data that's > marked not to be cached, the performance would 'sink' back down to a > sedate 12Mbytes/sec) - if it doesn't, something is lying somewhere :) sysutils/fio supports that: just add "fsync=x" to the configuration file and it'll send a request to the OS to flush the data to disk every x blocks. -- Bruce Cran
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