From: Andrew Morton <akpm@digeo.com>
To: Aaron Lehmann <aaronl@vitelus.com>
Cc: linux-kernel@vger.kernel.org, nfs@lists.sourceforge.net
Subject: Re: [PATCH] zerocopy NFS for 2.5.36
Date: Wed, 18 Sep 2002 20:30:52 -0700 [thread overview]
Message-ID: <3D8944EC.D129579D@digeo.com> (raw)
In-Reply-To: 20020919021333.GC20500@vitelus.com
Aaron Lehmann wrote:
>
> > akpm:/usr/src/cptimer> ./cptimer -d -s
> > nbytes=10240 from_align=0, to_align=0
> > copy_32: copied 19.1 Mbytes in 0.078 seconds at 243.9 Mbytes/sec
> > __copy_duff: copied 19.1 Mbytes in 0.090 seconds at 211.1 Mbytes/sec
>
> It's disappointing that this program doesn't seem to support
> benchmarking of MMX copy loops (like the ones in arch/i386/lib/mmx.c).
> Those seem to be the more interesting memcpy functions on modern
> systems.
Well the source is there, and the licensing terms are most reasonable.
But then, the source was there eighteen months ago and nothing happened.
Sigh.
I think in-kernel MMX has fatal drawbacks anyway. Not sure what
they are - I prefer to pretend that x86 CPUs execute raw C.
next prev parent reply other threads:[~2002-09-19 3:25 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 8:14 [PATCH] zerocopy NFS for 2.5.36 Hirokazu Takahashi
2002-09-18 23:00 ` David S. Miller
2002-09-18 23:54 ` Alan Cox
2002-09-19 0:16 ` Andrew Morton
2002-09-19 2:13 ` Aaron Lehmann
2002-09-19 3:30 ` Andrew Morton [this message]
2002-09-19 10:42 ` Alan Cox
2002-09-19 13:15 ` [NFS] " Hirokazu Takahashi
2002-09-19 20:42 ` Andrew Morton
2002-09-19 21:12 ` David S. Miller
2002-09-21 11:56 ` Pavel Machek
2002-10-14 5:50 ` Neil Brown
2002-10-14 6:15 ` David S. Miller
2002-10-14 10:45 ` kuznet
2002-10-14 10:48 ` David S. Miller
2002-10-14 12:01 ` Hirokazu Takahashi
2002-10-14 14:12 ` Andrew Theurer
2002-10-16 3:44 ` Neil Brown
2002-10-16 4:31 ` David S. Miller
2002-10-16 15:04 ` Andrew Theurer
2002-10-17 2:03 ` [NFS] " Andrew Theurer
2002-10-17 2:31 ` Hirokazu Takahashi
2002-10-17 13:16 ` Andrew Theurer
2002-10-17 13:26 ` Hirokazu Takahashi
2002-10-17 14:10 ` Andrew Theurer
2002-10-17 16:26 ` Hirokazu Takahashi
2002-10-18 5:38 ` Trond Myklebust
2002-10-18 7:19 ` Hirokazu Takahashi
2002-10-18 15:12 ` Andrew Theurer
2002-10-19 20:34 ` Hirokazu Takahashi
2002-10-22 21:16 ` Andrew Theurer
2002-10-23 9:29 ` Hirokazu Takahashi
2002-10-24 15:32 ` Andrew Theurer
2002-10-16 11:09 ` Hirokazu Takahashi
2002-10-16 17:02 ` kaza
2002-10-17 4:36 ` rddunlap
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