linux-kernel - Re: Disabling in-memory write cache for x86-64 in Linux II

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]

Date:	Tue, 29 Oct 2013 21:57:56 +0100
From:	Jan Kara <jack@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Ts'o <tytso@....edu>,
	"Artem S. Tashkinov" <t.artem@...os.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mgorman@...e.de
Subject: Re: Disabling in-memory write cache for x86-64 in Linux II

On Fri 25-10-13 10:32:16, Linus Torvalds wrote:
> On Fri, Oct 25, 2013 at 10:29 AM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> >
> > Apparently all this stuff isn't working as desired (and perhaps as designed)
> > in this case.  Will take a look after a return to normalcy ;)
> 
> It definitely doesn't work. I can trivially reproduce problems by just
> having a cheap (==slow) USB key with an ext3 filesystem, and going a
> git clone to it. The end result is not pretty, and that's actually not
> even a huge amount of data.
  I'll try to reproduce this tomorrow so that I can have a look where
exactly are we stuck. But in last few releases problems like this were
caused by problems in reclaim which got fed up by seeing lots of dirty
/ under writeback pages and ended up stuck waiting for IO to finish. Mel
has been tweaking the logic here and there but maybe it haven't got fixed
completely. Mel, do you know about any outstanding issues?

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
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/