netdev - Re: cat /proc/net/tcp takes 0.5 seconds on x86

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: <87fxoqqd62.fsf@basil.nowhere.org>
Date:	Thu, 28 Aug 2008 00:57:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	davej@...hat.com, netdev@...r.kernel.org, j.w.r.degoede@....nl
Subject: Re: cat /proc/net/tcp takes 0.5 seconds on x86_64

David Miller <davem@...emloft.net> writes:

> From: Andi Kleen <andi@...stfloor.org>
> Date: Thu, 28 Aug 2008 00:34:10 +0200
>
>> It fixes an old performance problem at least. I'm not aware 
>> of any new ones in this area because the code in this 
>> function hasn't changed since I last looked.
>
> That's exactly what this thread is about, things got slower for
> some reason even though nothing specifically changed in this area.

I reread the original bug and it says nothing about a regression
(unless I'm blind). I think the reporter just ran into the slowness that
was pretty much always there[1] (and which my patch improves)

-Andi

[1] ok it got more noticeable over time because people 
have more memory than they used to have, which made
the hash table bigger.

-- 
ak@...ux.intel.com
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html