Re[2]: 3.5G user space speed

Peter Zaitsev
2002-01-15T21:47:50Z

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.