From: "Bob Pearson" <rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>
To: 'Roland Dreier' <roland-BHEL68pLQRGGvPXPguhicg@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: RE: [patch 37/44] rxe_sb8.c
Date: Fri, 1 Jul 2011 18:09:10 -0500 [thread overview]
Message-ID: <000601cc3843$e3854cb0$aa8fe610$@systemfabricworks.com> (raw)
In-Reply-To: <CAL1RGDWLRw26RUr=WjUgzrn=6aGBukghoyOm5ordJv72mSsTBA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Hi Roland,
Perhaps. We have some ICRC specific APIs as well as plain Jane CRC
calculation that includes a copy at the same time.
If I knew who maintained crc32.c I would be happy to talk to them and see
what they think. The reason I wrote this
Is that crc32.c takes about 6 clocks per byte and this one takes < 2 clocks
per byte. We couldn't get over 200-300 MB/sec
With crc32.c and this algorithm was hitting 900MB/sec. Sandy Bridge has a
generic CRC instruction that should be able to
Reduce the time to nothing on top of a copy I have heard.
Bob
-----Original Message-----
From: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
[mailto:linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org] On Behalf Of Roland Dreier
Sent: Friday, July 01, 2011 5:04 PM
To: rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [patch 37/44] rxe_sb8.c
On Fri, Jul 1, 2011 at 6:18 AM, <rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org> wrote:
> Slice by 8 implementation of CRC32.
> The code code is similar to the kernel provided crc32 calculation
> except runs about 3X faster which allows us to get to ~1GB/sec.
Wouldn't the sane thing to do be to fix lib/crc32.c instead?
- R.
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the
body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at
http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-07-01 23:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 13:18 [patch 00/44] RDMA over Ethernet rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 01/44] ib_pack.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 02/44] rxe_hdr.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 03/44] rxe_opcode.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 04/44] rxe_opcode.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 05/44] rxe_param.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 06/44] rxe.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 07/44] rxe_loc.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 08/44] rxe_mmap.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 09/44] rxe_mmap.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 10/44] rxe_queue.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 11/44] rxe_queue.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 12/44] rxe_verbs.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 13/44] rxe_verbs.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 14/44] rxe_pool.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 15/44] rxe_pool.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 16/44] rxe_task.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 17/44] rxe_task.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 18/44] rxe_av.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 19/44] rxe_av.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 20/44] rxe_srq.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 21/44] rxe_srq.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 22/44] rxe_cq.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 23/44] rxe_cq.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 24/44] rxe_qp.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 25/44] rxe_qp.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 26/44] rxe_mr.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 27/44] rxe_mr.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 28/44] rxe_mcast.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 29/44] rxe_mcast.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 30/44] rxe_recv.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 31/44] rxe_comp.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 32/44] rxe_req.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 33/44] rxe_resp.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 34/44] rxe_arbiter.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
[not found] ` <20110701132202.342196794-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>
2011-07-03 7:52 ` Bart Van Assche
[not found] ` <CAO+b5-oh8Qavo1q5n1-KKa9XVmLcJ0s7ZZswC1Efp+gOgOAqQw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-07-03 15:21 ` Bob Pearson
2011-07-01 13:18 ` [patch 35/44] rxe_dma.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 36/44] gen_sb8tables.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:18 ` [patch 37/44] rxe_sb8.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
[not found] ` <20110701132202.486466900-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>
2011-07-01 22:03 ` Roland Dreier
[not found] ` <CAL1RGDWLRw26RUr=WjUgzrn=6aGBukghoyOm5ordJv72mSsTBA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-07-01 23:09 ` Bob Pearson [this message]
2011-07-02 16:55 ` David Dillow
[not found] ` <1309625729.20982.2.camel-1q1vX8mYZiGLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2011-07-14 5:03 ` Bob Pearson
2011-07-01 13:18 ` [patch 38/44] rxe.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 39/44] rxe_net.h rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 40/44] rxe_net.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 41/44] rxe_net_sysfs.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 42/44] rxe_sample.c rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 43/44] Makefile rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
2011-07-01 13:19 ` [patch 44/44] Kconfig rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5
[not found] ` <20110701132202.824114065-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>
2011-07-22 13:32 ` Bart Van Assche
[not found] ` <20110701131821.928693424-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>
2011-07-02 9:42 ` [patch 00/44] RDMA over Ethernet Bart Van Assche
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='000601cc3843$e3854cb0$aa8fe610$@systemfabricworks.com' \
--to=rpearson-klaocwyjdxkshymvu7je4pqqe7ycjdx5@public.gmane.org \
--cc=linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=roland-BHEL68pLQRGGvPXPguhicg@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.