From: Ingo Oeser <ioe-lkml@rameria.de>
To: Wu Fengguang <wfg@mail.ustc.edu.cn>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Michael Tokarev <mjt@tls.msk.ru>,
Jens Axboe <axboe@suse.de>
Subject: Re: [PATCH 4/5] readahead: backoff on I/O error
Date: Sat, 10 Jun 2006 20:33:45 +0200 [thread overview]
Message-ID: <200606102033.46844.ioe-lkml@rameria.de> (raw)
In-Reply-To: <349840680.03819@ustc.edu.cn>
Hi Fengguang,
On Friday, 9. June 2006 10:08, Wu Fengguang wrote:
> Backoff readahead size exponentially on I/O error.
> With this patch, retries are expected to be reduced from, say, 256, to 5.
1. Would you mind to push this patch to -stable?
Reason: If killing a drive was hit in the field, this should be critical
enough.
2. Could you disable (at least optionally) read ahead complety
on the first IO error?
Reason: In a data recovery situation (hitting EIO quite often,
but not really sequentially) readahead is counter productive.
E.g. trying to save an old CD with the cdparanoia software.
Regards
Ingo Oeser
next prev parent reply other threads:[~2006-06-10 18:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060609080801.741901069@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 0/5] Adaptive readahead updates 2 Wu Fengguang
[not found] ` <20060609081119.231751179@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 1/5] readahead: no RA_FLAG_EOF on single page file Wu Fengguang
[not found] ` <20060609081120.054527393@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 3/5] readahead: call scheme - no fastcall for readahead_cache_hit() Wu Fengguang
[not found] ` <20060609081120.531013274@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 4/5] readahead: backoff on I/O error Wu Fengguang
2006-06-10 18:33 ` Ingo Oeser [this message]
2006-06-10 19:48 ` Michael Tokarev
[not found] ` <20060612011245.GA5214@mail.ustc.edu.cn>
2006-06-12 1:12 ` Wu Fengguang
2006-06-12 3:43 ` Andrew Morton
2006-06-12 11:06 ` Michael Tokarev
2006-06-17 6:38 ` Michael Tokarev
2006-06-17 7:00 ` Michael Tokarev
[not found] ` <20060609081121.002572642@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 5/5] readahead: remove size limit on read_ahead_kb Wu Fengguang
2006-06-11 5:34 [PATCH 4/5] readahead: backoff on I/O error Just Marc
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