linux-ext4 - Re: Bad ext4 sync performance on 16 TB GPT partition

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: <alpine.LNX.2.00.1003121227040.13248@wong.science-computing.de>
Date:	Fri, 12 Mar 2010 12:37:31 +0100 (CET)
From:	Karsten Weiss <K.Weiss@...ence-computing.de>
To:	Eric Sandeen <sandeen@...hat.com>
cc:	Dmitry Monakhov <dmonakhov@...nvz.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Bad ext4 sync performance on 16 TB GPT partition

Hi Eric!

On Mon, 1 Mar 2010, Eric Sandeen wrote:

> > Sorry for the delay, here's the (good) 2.6.32 result:
> > 
> > # /usr/bin/time bash -c "dd if=/dev/zero of=/mnt/large/10GB bs=1M count=10000 && sync"
> > 10000+0 records in
> > 10000+0 records out
> > 10485760000 bytes (10 GB) copied, 46.3369 seconds, 226 MB/s
> > 0.00user 14.17system 0:59.53elapsed 23%CPU (0avgtext+0avgdata 6224maxresident)k
> > 0inputs+0outputs (0major+1045minor)pagefaults 0swaps
> > 
> > To summarize:
> > 
> > Bad:  2.6.18-164.el5 (CentOS)
> > Bad:  2.6.18-164.11.1el5 (CentOS)
> > Bad:  2.6.18-190.el5 (RH)
> > Good: 2.6.32
> > Good: 2.6.33

In the meantime I've also reproduced the problem on another machine with a 
Red Hat 5.5 Beta (x86_64) installation and decided to open a bug on RH's 
bugzilla:

Bad ext4 sync performance on 16 TB GPT partition
https://bugzilla.redhat.com/show_bug.cgi?id=572930

> Thanks, I'll have to investigate that.  I guess something may have gotten lost
> in translation in the 2.6.32->2.6.18 backport.....

Did you come up with anything I could test?

Is anyone else able to reproduce the problem?

-- 
Karsten Weiss
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html