[OpenIndiana-discuss] CIFS slow reads but fast writes

[Roy Sigurd Karlsbakk]

----- Original Message -----
> Hmmm, just got going on this (had to work late.) Anyway, I'm setting
> up the
> iscsi and cifs shares now, but as an experiment, I did this:
> 
> time dd of=/dev/null if=testfile bs=1M count=16K
> 
> write speed = 322 MB/s
> 
> then did this:
> 
> root at nas:/tank/smbtest# time dd of=/dev/null if=testfile bs=1M
> count=16K
> 
> read speed = 412 MB/s
> 
> seems like this lets disk/fs off the hook, no?

I'd use a real benchmark utility instead of just dd. Aslo keep in mind that this test won't do much i/o if you have compression enabled. CIFS may or may not use SYNC writes, iSCSI will (normally) use SYNC writes, so that will have some impact, but for reads, they shouldn't matter. In most (or all?) circumstances, reads should be faster than writes.

Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
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