On Wed, 30 Jun 2010 08:58:28 +0200 (CEST) Mikael Abrahamsson <swmike@xxxxxxxxx> wrote: > On Wed, 30 Jun 2010, Roman Mamedov wrote: > > > This is not necessary. See the dd man page about the conv=fdatasync switch. > > You can even test with just 256 MB this way, and still get an extremely > > accurate result. > > You're right, for writing this is ok. For read tests it's important to use > more than ram though, to avoid doing performance testing from block cache > instead of from the actual drives. Yeah, though there's also an alternative way of mitigating the effect of the cache when testing read speed, see http://linux-mm.org/Drop_Caches -- With respect, Roman
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