Re: VM Report was:Re: Break 2.4 VM in five easy steps

John Stoffel (stoffel@casc.com)
Fri, 8 Jun 2001 11:51:15 -0400


>>>>> "Tobias" == Tobias Ringstrom <tori@unhappy.mine.nu> writes:

Tobias> On Fri, 8 Jun 2001, Mike Galbraith wrote:

>> I gave this a shot at my favorite vm beater test (make -j30 bzImage)
>> while testing some other stuff today.

Tobias> Could you please explain what is good about this test? I
Tobias> understand that it will stress the VM, but will it do so in a
Tobias> realistic and relevant way?

I agree, this isn't really a good test case. I'd rather see what
happens when you fire up a gimp session to edit an image which is
*almost* the size of RAM, or even just 50% the size of ram. Then how
does that affect your other processes that are running at the same
time?

This testing could even be automated with the script-foo stuff to get
consistent results across runs, which is the prime requirement of any
sort of testing.

On another issue, in swap.c we have two defines for buffer_mem and
page_cache, but the first maxes out at 60%, while the cache maxes out
at 75%. Shouldn't they both be lower numbers? Or at least equally
sized?

I've set my page_cache maximum to be 60, I'll be trying to test it
over the weekend, but good weather will keep me outside doing other
stuff...

Thanks,
John
John Stoffel - Senior Unix Systems Administrator - Lucent Technologies
stoffel@lucent.com - http://www.lucent.com - 978-952-7548
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/