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1eeb4562a7
New functionality:
- Preserves existing scalar implementation.
- Adds AVX2 optimized Fletcher-4 computation.
- Fastest routines selected on module load (benchmark).
- Test case for Fletcher-4 added to ztest.
New zcommon module parameters:
- zfs_fletcher_4_impl (str): selects the implementation to use.
"fastest" - use the fastest version available
"cycle" - cycle trough all available impl for ztest
"scalar" - use the original version
"avx2" - new AVX2 implementation if available
Performance comparison (Intel i7 CPU, 1MB data buffers):
- Scalar: 4216 MB/s
- AVX2: 14499 MB/s
See contents of `/sys/module/zcommon/parameters/zfs_fletcher_4_impl`
to get list of supported values. If an implementation is not supported
on the system, it will not be shown. Currently selected option is
enclosed in `[]`.
Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4330
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SPA_CHECKSUM_H
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#define _SPA_CHECKSUM_H
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
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*/
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typedef struct zio_cksum {
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uint64_t zc_word[4];
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} zio_cksum_t;
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#define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
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{ \
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(zcp)->zc_word[0] = w0; \
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(zcp)->zc_word[1] = w1; \
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(zcp)->zc_word[2] = w2; \
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(zcp)->zc_word[3] = w3; \
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}
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#define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
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(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
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((zc1).zc_word[1] - (zc2).zc_word[1]) | \
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((zc1).zc_word[2] - (zc2).zc_word[2]) | \
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((zc1).zc_word[3] - (zc2).zc_word[3])))
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#define ZIO_CHECKSUM_IS_ZERO(zc) \
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(0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
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(zc)->zc_word[2] | (zc)->zc_word[3]))
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#define ZIO_CHECKSUM_BSWAP(zcp) \
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{ \
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(zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]); \
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(zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]); \
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(zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]); \
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(zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]); \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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