From: Doron Shoham <dorons@voltaire.com>
To: linux-scsi@vger.kernel.org
Subject: using direct IO with sgp_dd
Date: Tue, 11 Mar 2008 09:40:08 +0200 [thread overview]
Message-ID: <47D63758.9000601@voltaire.com> (raw)
Hi,
I wanted to use direct IO with sgp_dd.
I have done:
echo 1 > /proc/scsi/sg/allow_dio
sgp_dd if=/dev/sg1 of=/dev/null bs=512 bpt=128 thr=8 time=1 count=5M dio=1
time to transfer data was 2.236290 secs, 1200.36 MB/sec
5242880+0 records in
5242880+0 records out
Direct IO requested but incomplete 40960 times
What does it mean "Direct IO requested but incomplete 40960 times"?
And what could be the reason for this?
When using bpt smaller then 128 it doesn't happen.
Thanks,
Doron
next reply other threads:[~2008-03-11 7:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-11 7:40 Doron Shoham [this message]
2008-03-11 8:50 ` using direct IO with sgp_dd Bart Van Assche
2008-03-11 9:12 ` Doron Shoham
2008-03-12 22:46 ` Douglas Gilbert
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