Sage, Based on the discussion of today's performance meeting, I ran the crc32 unittest and here is the result. root@emsserver2:/home/ceph-main/src# ./unittest_crc32c Running main() from gmock_main.cc [==========] Running 7 tests from 1 test case. [----------] Global test environment set-up. [----------] 7 tests from Crc32c [ RUN ] Crc32c.Small [ OK ] Crc32c.Small (0 ms) [ RUN ] Crc32c.PartialWord [ OK ] Crc32c.PartialWord (0 ms) [ RUN ] Crc32c.Big [ OK ] Crc32c.Big (16 ms) [ RUN ] Crc32c.Performance populating large buffer calculating crc best choice = 1193.86 MB/sec best choice 0xffffffff = 1193.56 MB/sec sctp = 1190.6 MB/sec intel baseline = 261.623 MB/sec [ OK ] Crc32c.Performance (7064 ms) [ RUN ] Crc32c.Range [ OK ] Crc32c.Range (0 ms) [ RUN ] Crc32c.RangeZero [ OK ] Crc32c.RangeZero (0 ms) [ RUN ] Crc32c.RangeNull [ OK ] Crc32c.RangeNull (0 ms) [----------] 7 tests from Crc32c (7080 ms total) [----------] Global test environment tear-down [==========] 7 tests from 1 test case ran. (7080 ms total) [ PASSED ] 7 tests. So, it seems 'sctp' is giving better performance and thus it is recommending this. So, it seems it is not picking up *_intel_fast method and going back to make file I saw 'configure' was skipping yasm check since in my setup yasm was not installed. I manually installed 'yasm' and rebuild everything. Now, here is the result..It is picking up *_intel_fast method and it is ~6 times faster !!! root@emsserver2:/home/ceph-main/src# ./unittest_crc32c Running main() from gmock_main.cc [==========] Running 7 tests from 1 test case. [----------] Global test environment set-up. [----------] 7 tests from Crc32c [ RUN ] Crc32c.Small [ OK ] Crc32c.Small (0 ms) [ RUN ] Crc32c.PartialWord [ OK ] Crc32c.PartialWord (0 ms) [ RUN ] Crc32c.Big [ OK ] Crc32c.Big (4 ms) [ RUN ] Crc32c.Performance populating large buffer calculating crc best choice = 6275.01 MB/sec best choice 0xffffffff = 6314.59 MB/sec sctp = 1187.1 MB/sec intel baseline = 261.652 MB/sec [ OK ] Crc32c.Performance (5709 ms) [ RUN ] Crc32c.Range [ OK ] Crc32c.Range (0 ms) [ RUN ] Crc32c.RangeZero [ OK ] Crc32c.RangeZero (0 ms) [ RUN ] Crc32c.RangeNull [ OK ] Crc32c.RangeNull (0 ms) [----------] 7 tests from Crc32c (5713 ms total) [----------] Global test environment tear-down [==========] 7 tests from 1 test case ran. (5713 ms total) [ PASSED ] 7 tests. Thanks for the pointer and I will enable my journal tests with crc enabled. BTW, I think we need to error out configure script (or at least document ) if build server is not having 'yasm' installed. Thanks & Regards Somnath ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies). -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
