From: Erik Mouw <erik@harddisk-recovery.com>
To: Rajesh <rvarada@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: debug a high load average
Date: Tue, 23 Aug 2005 15:30:50 +0200 [thread overview]
Message-ID: <20050823133050.GC29062@harddisk-recovery.com> (raw)
In-Reply-To: <430B03B4.8040205@gmail.com>
On Tue, Aug 23, 2005 at 04:38:36PM +0530, Rajesh wrote:
> I have a case occasionally when I copy data from a usb storage (ipod) to
> my hard drive the load average goes up from 0.4 to about 15.0, and the
> system becomes very unusable till I kill the cp command. I have checked
> the CPU usage, bytes read from usb device, byte written to hard drive
> etc, and all these values are low like CPU usage is at a maximum of 30%,
> disk read bytes is at an average of 1.5 MiB/s, disk write bytes is at
> 1.5 MiB/s, number of processes is at 110, etc, during this high load.
1.5 MB/s suggests you're using an IDE drive in PIO mode. Switch to DMA
mode (hdparm -d 1 /dev/hda) and see if it gets any better.
Erik
--
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
next prev parent reply other threads:[~2005-08-23 13:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-23 11:08 debug a high load average Rajesh
2005-08-23 13:30 ` Erik Mouw [this message]
2005-08-24 4:40 ` Rajesh
2005-08-24 8:01 ` Mariusz Zielinski
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