From: Jens Axboe <axboe@suse.de>
To: Ivanovich <ivanovich@menta.net>
Cc: war <war@starband.net>, linux-kernel@vger.kernel.org
Subject: Re: Impact of HIGHMEM?
Date: Sat, 8 Dec 2001 21:05:29 +0100 [thread overview]
Message-ID: <20011208200529.GA11567@suse.de> (raw)
In-Reply-To: <3C1263FE.EBD973FA@starband.net> <01120820485101.01267@localhost.localdomain>
In-Reply-To: <01120820485101.01267@localhost.localdomain>
On Sat, Dec 08 2001, Ivanovich wrote:
> A Dissabte 08 Desembre 2001 20:03, war va escriure:
> > Does anyone have any benchmarks as to how much HIGHMEM affects
> > performance in Linux?
> >
> > Searched google.com + groups.google.com, couldn't find anything solid
> > though.
>
> why don't you try to compile a kernel with HIGHMEM and another without it and
> then run some benchmarks in each one and compare?
You'll very quickly spend a significant amount of sys time copying pages
back and forth.
> not everyone have the amount of ram to test this (i only have
> 256...(sigh)) if i had that amount i would run some bench...
You don't need lots of mem to test highmem impact, just grab the highmem
debug patch from Andrea:
kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.17pre4aa1/20_highmem-debug-7
--
Jens Axboe
next prev parent reply other threads:[~2001-12-08 20:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-08 19:03 Impact of HIGHMEM? war
2001-12-08 19:57 ` Ivanovich
2001-12-08 20:05 ` Jens Axboe [this message]
2001-12-08 23:30 ` Ivanovich
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