Re: [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat

Nick Piggin
2004-09-06T08:55:16Z

David S. Miller wrote:
> On Sun, 05 Sep 2004 20:09:30 +1000
> Nick Piggin <nickpiggin@yahoo.com.au> wrote:
>
>
>>Yeah I had seen a few, surprisingly few though. Sorry I'm a bit clueless
>>about networking - I suppose there is a good reason for the 16K MTU? My
>>first thought might be that a 4K one could be better on CPU cache as well
>>as lighter on the mm. I know the networking guys know what they're doing
>>though...
>
>
> It's better to get as long a stride as possible for the copy
> from userspace, and yes as you get larger you run into cache
> issues. 16K turned out the be the break point considering those
> two attributes when I did my testing.
>

OK. Makes sense.

> Just fool around with ifconfig lo mtu XXX and TCP bandwidth tests.
> See what you come up with.
>

Thanks, I'll give that a try. I don't nearly have access to a
representitive range of architectures, but if I see anything
interesting on what I've got, I'll ping you.