linux-ext4 - Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

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 for Android: free password hash cracker in your pocket

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

Message-ID: <CA+55aFyHUaxJJB7J8C=DQEGprL+YhzN23dYGxszoYiVur0kgqw@mail.gmail.com>
Date:	Fri, 13 Apr 2012 11:08:20 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, "Ted Ts'o" <tytso@....edu>,
	Vivek Haldar <haldar@...gle.com>,
	Andreas Dilger <adilger@...ger.ca>, linux-ext4@...r.kernel.org
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

On Fri, Apr 13, 2012 at 10:53 AM, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
>>
>> Do you have numbers?
>
> In a benchmark that does mmaped-read, there is a 28% speed up
> after getting rid of the counters.

Ok, that's big. But is it any actual real workload on a real
filesystem? It looks like this should only happen for actual IO, so I
get the feeling that this is some made-up benchmark for a filesystem
on a RAM-disk?

                  Linus
--
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