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From: Eric Dumazet <eric.dumazet@gmail.com>
To: starlight@binnacle.cx
Cc: linux-kernel@vger.kernel.org, netdev <netdev@vger.kernel.org>,
	Willy Tarreau <w@1wt.eu>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Stephen Hemminger <stephen.hemminger@vyatta.com>
Subject: Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32
Date: Wed, 05 Oct 2011 08:53:47 +0200	[thread overview]
Message-ID: <1317797627.3099.1.camel@edumazet-laptop> (raw)
In-Reply-To: <6.2.5.6.2.20111003140010.05a70ed0@binnacle.cx>

Le lundi 03 octobre 2011 à 14:02 -0400, starlight@binnacle.cx a écrit :
> At 06:16 PM 10/3/2011 +0200, Eric Dumazet wrote:
> >
> >It seems you use 4096 2MB hugepages, and your
> >machine has 1GB pages availabe, you could
> >try to use them.
> >
> >(boot cmd : hugepagesz=1GB hugepages=8 )
> 
> Tried it and got errno 12 on the segment
> allocations.  None were allocated, though
> the count is six and the largest is exactly
> 1GB.  Don't have time to dig into it.
> 

Thats pretty normal ;)

With 2MB pages, your segment size must be a 2MB multiple.

With 1GB pages, your segment size must be a .... 1GB multiple.

So only applicable is say you handle one big 8GB segment for example, or
2 4GB segments... Well you see the picture.

  reply	other threads:[~2011-10-05  6:53 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-03 18:02 big picture UDP/IP performance question re 2.6.18 -> 2.6.32 starlight
2011-10-05  6:53 ` Eric Dumazet [this message]
  -- strict thread matches above, loose matches on Subject: below --
2011-10-07  3:27 starlight
2011-10-07  5:40 ` Eric Dumazet
2011-10-07  6:13   ` starlight
2011-10-07 18:09     ` chetan loke
     [not found]       ` <CAAsGZS4s1wTWW1j7FRUWW9jqpPUVF3Q46AMa7+njvE1ckX0Snw @mail.gmail.com>
2011-10-07 18:37         ` starlight
2011-10-07 19:27           ` chetan loke
     [not found]             ` <CAAsGZS4b2F9N3nV3TNu5xG+=2d0L0ncste4xv2vqoVFb1pOxEw @mail.gmail.com>
2011-10-07 19:41               ` starlight
2011-10-07 20:07           ` Ben Hutchings
2011-10-11 16:24   ` Chris Friesen
2011-10-07  2:33 starlight
2011-10-07  2:24 starlight
2011-10-05  6:58 starlight
2011-10-05  8:53 ` Eric Dumazet
     [not found]   ` <1317804832.2473.25.camel@edumazet-HP-Compaq-6005-Pr o-SFF-PC>
2011-10-05 11:50     ` starlight
2011-10-05  6:11 starlight
2011-10-05  3:35 starlight
2011-10-03 15:25 starlight
2011-10-03 16:16 ` Eric Dumazet
     [not found]   ` <1317658588.2442.5.camel@edumazet-HP-Compaq-6005-Pro -SFF-PC>
2011-10-03 16:28     ` starlight
2011-10-04 19:16 ` Christoph Lameter
2011-10-04 19:38   ` Joe Perches
2011-10-04 19:42     ` Christoph Lameter
2011-10-04 19:49       ` Serge Belyshev
2011-10-04 20:03         ` Christoph Lameter
2011-10-04 20:12           ` Serge Belyshev
2011-10-04 22:32             ` Con Kolivas
2011-10-04 19:45     ` starlight
2011-10-05 13:22   ` Peter Zijlstra
2011-10-05 14:26     ` Christoph Lameter
2011-10-05 15:12       ` Andi Kleen
2011-10-05 15:33       ` Peter Zijlstra
2011-10-05 15:12     ` starlight
2011-10-02  5:33 starlight
2011-10-02  7:21 ` Eric Dumazet
2011-10-02  8:03   ` Eric Dumazet
2011-10-02 14:47   ` Stephen Hemminger
2011-10-02 15:06   ` starlight
2011-10-04 19:54     ` Loke, Chetan
2011-10-01 21:13 starlight
2011-10-01 18:16 starlight
2011-10-01 18:40 ` Willy Tarreau
2011-10-01 19:11 ` Eric Dumazet
2011-10-01 19:43   ` starlight
     [not found] <6.2.5.6.2.20111001012019.05c05b80@flumedata.com>
2011-10-01  6:44 ` Eric Dumazet
2011-10-01 15:56   ` starlight

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