Date: Mon, 1 Nov 2004 03:33:13 -0800 (PST) From: Arne "Wörner" <arne_woerner@yahoo.com> To: freebsd-performance@freebsd.org Subject: hw.ata.wc=0 Message-ID: <20041101113313.25399.qmail@web41204.mail.yahoo.com>
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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. -Arne __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail
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