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Date: Wed, 16 Jan 2002 00:49:10 +0300
From: Peter Zaitsev <pz@spylog.ru>
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To: Brian Gerst <bgerst@didntduck.org>
Cc: Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re[2]: 3.5G user space speed
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Hello Brian,

Wednesday, January 16, 2002, 12:41:56 AM, you wrote:
>>
>> Well. May be you can tell about the numbers a bit ? I can chose 3.0G
>> for user instead of 3.5G for user with not really huge loss, but I'd
>> like to know how much it will increase speed and in which cases, also
>> about standard 2/2 mode.

BG> I don't have quantifiable numbers available, but the speed issue will be
BG> a result of the kernel running out of direct-mapped memory and having to
BG> start swapping even though there is free memory in the system (in the
BG> highmem zone).  The best thing you can do is try both and find what
BG> works best for you.

So how this should appear ? Like real swapping or like increased
system CPU usage because of moving pages to/from zone.


-- 
Best regards,
 Peter                            mailto:pz@spylog.ru

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