linux-kernel - Re: Kernel 2.6 SMP very slow with ServerWorks LE Chipset

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: <20061207110737.6c506c98@localhost.localdomain>
Date:	Thu, 7 Dec 2006 11:07:37 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Bob <spam@...eurl.co.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kernel 2.6 SMP very slow with ServerWorks LE Chipset

> As a test of raw CPU power I've been decompressing the kernel tree, with 
> a UP 2.6 kernel this takes about 1m 15s, I don't know if bz2 is 
> multithreaded but even if it's not I would expect a slight speed increase 
> but in fact with a SMP 2.6 kernel it take 13 ~ 26m, with a SMP 2.4 
> kernel it takes 1m 28s and with a 2.4 UP 1m 35s. 

The 2.4 numbers look correct (slightly slower), the 2.6 numbers do not.

Nothing obviously wrong from the traces however. If you pin the bzip to a
given processor do you get different results according to which CPU ?

(see man taskset for info on the commands)

If you get very different times on the two processors that will be very
useful information.
-
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/