DragonFly users List (threaded) for 2008-07
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DragonFly users List (threaded) for 2008-07
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Re: Hammer performance


From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 7 Jul 2008 09:10:15 -0700 (PDT)

:
:Abother strange thing occurs if I "dd" directly to the device:
:
:   dd if=/dev/zero of=/dev/ad4s1d count=20000
:   20000+0 records in
:   20000+0 records out
:   10240000 bytes transferred in 7.361097 secs (1391097 bytes/sec)
:
:Here I only get around 1.4 MB/sec. Shouldn't that me a much higer value?
:
:Regards,
:
:   Michael

    If you do not specify a block size parameter to dd it will be doing
    512 byte writes.  A typical block size is 32k, e.g.:

    dd if=/dev/zero of=/blah bs=32k count=10240

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>



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