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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Paolo <paoletto@gmail.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: libata sata_via unusual behaviour
Date: Sat, 17 May 2008 23:04:43 +0100	[thread overview]
Message-ID: <20080517230443.2a3eedff@core> (raw)
In-Reply-To: <3bbeafe90805170656v58ad2dc5nb6c1efcf55b8f2cf@mail.gmail.com>

> real    5m16.352s
> user    0m0.132s
> sys     0m6.244s

So the CPU usage is ok

> root@ubuntu:/media/disk/movies# ls -la Lo\ squalo.avi
> -rw-r----- 1 1000 1001 1559521280 2008-03-30 06:37 Lo squalo.avi
> 
> it means roughly those old 5mb/sec.
> In the meanwhile i checked with top, and all the cpu cycles were taken
> by the disk (about 98.0%wa and 0.0%id)

98.0%wa - wait time, not CPU time.

Its still a very slow copy rate unless the disks are on the same IDE
channel. How is the disk set up - ext3 direct or via raid/lvm ?

Also is a copy of the movie to /dev/null slow or fast, ditto a copy
from /dev/zero to disk of that sort of size ?

Alan

  parent reply	other threads:[~2008-05-17 22:16 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <3bbeafe90805011018o28f46794h369242ccb02b7ced@mail.gmail.com>
2008-05-01 18:58 ` libata sata_via unusual behaviour Paolo
2008-05-01 18:58   ` Alan Cox
2008-05-02  2:40     ` Mark Lord
     [not found]     ` <3bbeafe90805011216l1780cf5bm9bad77a414062643@mail.gmail.com>
     [not found]       ` <20080501211019.21b0701d@core>
2008-05-17 13:56         ` Paolo
2008-05-17 14:45           ` Paolo
2008-05-17 22:04           ` Alan Cox [this message]
2008-05-18  7:07             ` Paolo

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