[lkml]   [2001]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: speed difference between using hard-linked and modular drives?
On 09 Nov 2001 00:00:19 +0100
Andi Kleen <> wrote:

> Ingo Molnar <> writes:
> >
> > we should fix this by trying to allocate continuous physical memory if
> > possible, and fall back to vmalloc() only if this allocation fails.
> Check -aa. A patch to do that has been in there for some time now.
> -Andi
> P.S.: It makes a measurable difference with some Oracle benchmarks with
> the Qlogic driver.

Modules have lots of little disadvantages that add up. The speed penalty
on various platforms is one, the load/unload race complexity is another.

There's a widespread "modules are free!" mentality: they're not, and we
can add complexity trying to make them "free", but it might be wiser to
realize that dynamic adding and deleting from a running kernel is a
problem on par with a pagagble kernel, and may not be the greatest thing
since sliced bread.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:13    [W:0.184 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site