linux-kernel - Re: [performance bug] kernel building regression on 64 LCPUs machine

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:	Thu, 24 Feb 2011 13:13:39 +0100
From:	Jan Kara <jack@...e.cz>
To:	"Alex,Shi" <alex.shi@...el.com>
Cc:	Jan Kara <jack@...e.cz>, "Li, Shaohua" <shaohua.li@...el.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [performance bug] kernel building regression on 64 LCPUs
 machine

On Wed 23-02-11 16:24:47, Alex,Shi wrote:
> Though these patches can not totally recovered the problem, but they are
> quite helpful with ccache enabled situation. It increase 10% performance
> on 38-rc1 kernel. 
  OK and what was the original performance drop with WRITE_SYNC change?

> I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here: 
> with patches:
  I'm attaching patches rebased on top of latest Linus's tree. 
Corrado, could you possibly run your fsync-heavy tests so that we see
whether there isn't negative impact of my patches on your fsync-heavy
workload? Thanks.

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

View attachment "0001-jbd2-Refine-commit-writeout-logic.patch" of type "text/x-patch" (10946 bytes)

View attachment "0002-jbd-Refine-commit-writeout-logic.patch" of type "text/x-patch" (9844 bytes)