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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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