lkml.org 
[lkml]   [2008]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0 of 9] x86/smp function calls: convert x86 tlb flushes to use function calls [POST 2]

* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> On Tuesday 19 August 2008 20:20, Ingo Molnar wrote:
> > * Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> > > I'm especially sore about mmap because I have a customer with a
> > > database that uses a lot of mmap/munmap and those calls have slowed
> > > down something like 50%(!!) from 2.6.early to 2.6.late.
> >
> > oh, agreed that it all needs to speed up - please send testcases ...
>
> I'm not sure if I can send the testcase I have. But this issue is
> coming to the top of my list to investigate in mainline, so I'll check
> out how we're doing here soon.

obviously having a repeatable testcase would jump-start any efforts to
fix this. It doesnt have to be complex - just a .c thing kernel
developers can run and get some quick number out of. A 50% regression
shouldnt be too hard to reproduce even with a vastly simplified
workload.

Ingo


\
 
 \ /
  Last update: 2008-08-19 13:47    [W:0.108 / U:7.364 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site