linux-kernel - Re: [2.6.26-rc2-mm1] sync to speed up?

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Date:	Tue, 20 May 2008 10:14:19 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Theodore Tso" <tytso@....edu>,
	"Dave Young" <hidave.darkstar@...il.com>,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [2.6.26-rc2-mm1] sync to speed up?

On Tue, May 20, 2008 at 7:05 AM, Theodore Tso <tytso@....edu> wrote:
> On Mon, May 19, 2008 at 03:15:09PM +0800, Dave Young wrote:
>> Hi,
>>
>> With 2.6.26-rc2-mm1 I need to sync frequently. It's not normal as my
>> understanding.
>>
>> 1. scp a big file from a lan server. Firstly the speed is about 8M/s,
>> but the speed will slow down to 100K/s at last. After I exec "sync",
>> the speed will restore.
>>
>> Is this a known issue?
>
> Dave, what filesystem are you using?  Jiri's patch on this thread was
> to fix a problem in ext4, which means that's fixing a problem which is
> unrelated to the slow mkfs.ext2 problem (which is writing to a block
> device, not a file in a ext4 filesystem), and so it's likely unrelated
> to your problem (unless you're using ext4 and didn't tell us :-).

I'm using ext3. Jiri's patch fixes the my problem.  Seems the problem
is not related to filesystem.

>
> Andrew's probably right that it may be related to the slow mkfs
> problem.  Can you confirm that you are seeing this on 2.6.26-rc2-mm1,
> but not on stock 2.6.26.rc2?

I didn't notice same thing on 2.6.26-rc2, is it necessary for me to test on it?

Regards
dave
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