From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <andi@firstfloor.org>, torvalds@linux-foundation.org
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: fallout of 16K stacks
Date: Mon, 07 Jul 2014 15:49:48 -0700 [thread overview]
Message-ID: <53BB240C.30400@zytor.com> (raw)
In-Reply-To: <20140707223001.GD18735@two.firstfloor.org>
On 07/07/2014 03:30 PM, Andi Kleen wrote:
>
> Since the 16K stack change I noticed a number of problems with
> my usual stress tests. They have a tendency to bomb out
> because something cannot fork.
As in ENOMEM or does something worse happen?
> - AIM7 on a dual socket socket system now cannot reliably run
>> 1000 parallel jobs.
... with how much RAM?
> - LTP stress + memhog stress in parallel to something else
> usually doesn't survive the night.
>
> Do we need to strengthen the memory allocator to try
> harder for 16K?
Can we even? The probability of success goes down exponentially in the
order requested. Movable pages can help, of course, but still, there is
a very real cost to this :(
-hpa
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next prev parent reply other threads:[~2014-07-07 22:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-07 22:30 Andi Kleen
2014-07-07 22:49 ` H. Peter Anvin [this message]
2014-07-07 23:04 ` Andi Kleen
2014-07-07 23:52 ` Linus Torvalds
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