Date: Mon, 1 Nov 2004 03:33:13 -0800 (PST)
To: freebsd-performance@freebsd.org
I observed some inconsistencies after I set hw.ata.wc to zero (0):
1. atacontrol does not confirm that write caching is disabled.
2. The write speed on a freshly boot system increases by a factor of 5-6 after
a long read.
I would like to know, if somebody here has experiences with turning off the
write cache of ata devices (how to turn off / how much is performance effected
by the hard disc write cache).
Thank you.
I already posted this to freebsd-fs@freebsd.org but they did not know so much
about this matter.
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