Write cache, is write cache, is write cache?

[Bruce Cran]

On Sat, 22 Jan 2011 15:51:21 +0000
Karl Pielorz <kpielorz_lst at 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