DragonFly users List (threaded) for 2008-07
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Re: Hammer performance
Michael Neumann wrote:
Hi,
Just compared writing a 1 GB large file with Hammer and got:
dragnas# dd if=/dev/zero of=test count=2000000
2000000+0 records in
2000000+0 records out
1024000000 bytes transferred in 26.880290 secs (38094827 bytes/sec)
When I do the same (on the same hard disk) with UFS, I get around twice
the write performance:
dd if=/dev/zero of=test count=2000000
2000000+0 records in
2000000+0 records out
1024000000 bytes transferred in 12.816585 secs (79896477 bytes/sec)
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
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