2009/9/2 Emil Mikulic <emikulic_at_gmail.com>: > On Wed, Sep 02, 2009 at 08:04:04AM -0400, Derek (freebsd lists) wrote: >> Hi, >> >> I've been testing the new siis driver, and I have found no >> appreciable performance change, using dd as a measure of "raw" >> performance. >> >> I get about 40MB/s read, and 30MB/s write. See attached >> bench-*.txt files. > > [...] > >> ada0: <ST31500341AS CC1H> ATA/ATAPI-8 SATA 2.x device >> ada0: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C) > > Huh, I have the same disk: > > # dmesg | grep ad4 > ad4: 1430799MB <Seagate ST31500341AS CC1H> at ata2-master SATA300 > > Sequential read on a disk this size should be around 120MB/sec at the > outer tracks: > > # dd if=/dev/ad4 of=/dev/null bs=128k count=5000 > 655360000 bytes transferred in 5.171389 secs (126728039 bytes/sec) > >> Also I find it surprising that my gmirror read is only 40MB/s, >> and not 60-80MB/s, any thoughts on this? > > Stripe will give you higher throughput. > Mirror will give you more random seeks per second. And higher read throughput. > > --Emil > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org" > -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier_at_gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."Received on Wed Sep 02 2009 - 12:36:31 UTC
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