linux-kernel - Re: [PATCH] fix readahead pipeline break caused by block plug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120201091807.GA7451@infradead.org>
Date:	Wed, 1 Feb 2012 04:18:07 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Jens Axboe <axboe@...nel.dk>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Wu Fengguang <wfg@...ux.intel.com>
Subject: Re: [PATCH] fix readahead pipeline break caused by block plug

On Tue, Jan 31, 2012 at 10:36:53PM -0500, Vivek Goyal wrote:
> I still see that IO is being submitted one page at a time. The only
> real difference seems to be that queue unplug happening at random times
> and many a times we are submitting much smaller requests (40 sectors, 48
> sectors etc).

This is expected given that the block device node uses
block_read_full_page, and not mpage_readpage(s).
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/