-----Original Message----- From: Roy Sigurd Karlsbakk [mailto:[email protected]] Sent: Tuesday, April 19, 2011 5:44 AM To: Discussion list for OpenIndiana Subject: Re: [OpenIndiana-discuss] CIFS slow reads but fast writes
----- 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@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. **** For what it's worth, I disabled sync before doing any of the tests. No compression involved. The crystaldiskmark test I was doing does sequential reads and then sequential writes, which I thought would be reasonably modeled by 'dd'. _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
