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From: Hugh Dickins <hugh@veritas.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tomasz Chmielewski <mangoo@wpkg.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Mika Lawando <rzryyvzy@trashmail.net>
Subject: Re: What is the limit size of tmpfs /dev/shm ?
Date: Wed, 6 Feb 2008 21:58:24 +0000 (GMT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802062150440.16791@blonde.site> (raw)
In-Reply-To: <47AA102F.1070105@zytor.com>

On Wed, 6 Feb 2008, H. Peter Anvin wrote:
> 
> That sounds like a problem in our overall swap handling, not specifically in
> tmpfs.  Now, I can't say anything concrete about heavy swap conditions, but in
> light swap conditions I have measured a 20x performance improvement(!) over
> ext3 on real workloads.

Wow, I'm surprised.  I suppose I do jump to thinking of heavy swapping
when light swapping won't be so bad; but even so, 20x ext3 astonishes
me - ext3 wouldn't be anyone's choice for fastest, but even so...

I certainly guess too much and measure too little:
is there a useful test you could point me to?  TIA

Hugh

  reply	other threads:[~2008-02-06 21:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 14:54 Tomasz Chmielewski
2008-02-06 15:06 ` rzryyvzy
2008-02-06 15:29 ` Hugh Dickins
2008-02-06 19:27   ` H. Peter Anvin
2008-02-06 19:48     ` Hugh Dickins
2008-02-06 19:53       ` H. Peter Anvin
2008-02-06 21:58         ` Hugh Dickins [this message]
2008-02-06 22:01           ` H. Peter Anvin
2008-02-06 22:40             ` Hugh Dickins
  -- strict thread matches above, loose matches on Subject: below --
2008-02-06 13:54 Mika Lawando

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