linux-kernel - Re: Remove constructor from buffer

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Message-ID: <Pine.LNX.4.64.0705032033560.16788@schroedinger.engr.sgi.com>
Date:	Thu, 3 May 2007 20:34:48 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Remove constructor from buffer_head

On Thu, 3 May 2007, Andrew Morton wrote:

> On Thu, 3 May 2007 20:08:41 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
> 
> > Performance tests show a slight improvements in netperf (not a
> > strong case for a performance improvement but removing the
> > constructor has definitely no negative impact so why keep
> > this around?).
> > 
> > TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost (127.0.0.1) port 0 AF_INET
> > Recv   Send    Send
> > Socket Socket  Message  Elapsed
> > Size   Size    Size     Time     Throughput
> > bytes  bytes   bytes    secs.    10^6bits/sec
> > 
> > Before:
> >  87380  16384  16384    10.01    6026.04
> >  87380  16384  16384    10.01    5992.17
> >  87380  16384  16384    10.01    6071.23
> > 
> > After:
> >  87380  16384  16384    10.01    6090.20
> >  87380  16384  16384    10.01    6078.3
> >  87380  16384  16384    10.00    6013.52
> 
> How could a filesystem change affect networking performance?
> 
> The change looks nice, but I'd microbenchmark it with a write-to-ext2-on-ramdisk
> or something like that.

Hmmmm.. I was told in another thread that this is the most frequently used 
slab for this benchmark ...... Just accepted that as true.
 
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