Date: Wed, 28 Mar 2007 07:00:29 -0700 (PDT) From: "R. B. Riddick" <arne_woerner@yahoo.com> To: "Szabó" "Péter" <matyee@mail.alba.hu>, freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <299130.71872.qm@web30305.mail.mud.yahoo.com> In-Reply-To: <009601c7713f$6b9f2a60$6502a8c0@peteruj>
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Eric wrote: >>> inside: 102400 kbytes in 3.416896 sec = 29969 kbytes/sec >>> >> Looks slow... > > You think so? I think that's pretty acceptable for a UDMA100 device. > Yup... I thought, it was 2MB/sec... Dont know why... 29-55 is good... --- Szabó Péter <matyee@mail.alba.hu> wrote: > > And what if u try this: > > dd if=/dev/raid3/... of=/dev/null bs=1m count=128 > > ? > > #dd if=/dev/raid3/nmivol of=/dev/null bs=1m count=128 > 128+0 records in > 128+0 records out > 134217728 bytes transferred in 1.555843 secs (86266891 bytes/sec) > OK > > 8KB/transfer is a little low for my taste... Looks like ur copy program > > uses > > 32KB transfers, instead of 128KB transfers... > > > What if u try > > dd if=/source-file/on/raid3-device of=/dev/null bs=1m count=128 > > ? > > dd if=/mnt/vol/site/video/Sissi_2-3/SISSI_2.ISO of=/dev/null bs=1m count=128 > 128+0 records in > 128+0 records out > 134217728 bytes transferred in 6.096775 secs (22014545 bytes/sec) > Hmm... It is still quite slow (the raw device can do about 80MB/sec)... Is it better than with mc? How was CPU-usage / system-load? -Arne ____________________________________________________________________________________ Expecting? Get great news right away with email Auto-Check. Try the Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html
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