From mboxrd@z Thu Jan 1 00:00:00 1970 From: Max Waterman Subject: Re: md faster than h/w? Date: Tue, 17 Jan 2006 17:18:30 +0800 Message-ID: References: <43CB3033.8070803@fastmail.co.uk> <20060116141257.85428.qmail@web54604.mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20060116141257.85428.qmail@web54604.mail.yahoo.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Andargor wrote: > > --- Max Waterman > wrote: > >>Of course, bonnie++ only works on mounted devices, >>but gives me >>reasonable (but not great) numbers (130MB/s) which >>don't seem to vary >>too much with the kernel version. > > > Out of curiosity, have you compared bonnie++ results > with and without -f (fast)? Nope. Just used default options (as well as the '-u' and '-d' options, of course). > > I've found that it seems to report x2 read throughput > without -f. Perhaps it "warms up" the drive with > putc() and getc(), allowing the kernel and/or cache to > do its job? Hrm. > > I haven't found a benchmark that is 100% > reliable/comparable. Of course, it all depends how the > drive is used in production, which may have little > correlation with the benchmarks... Indeed. Do you think that if it is configured for the best possible read performance, then that would be it's worst possible write performance? I was hoping that having it configured for good read perf. would mean it was pretty good for write too.... Max. > > Andargor > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >