Messages in this thread |  | | Date | Sat, 6 Oct 2001 13:20:23 +0100 (BST) | From | <> | Subject | VM: 2.4.10ac4 vs. 2.4.11pre2 |
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Hi,
Here are some test results. Results are averaged over multiple runs. Comments and conclusions below.
2.4.11pre2 2.4.10ac4 dbench 8 34Mbyte/sec 40Mbyte/sec dbench 32 7.7Mbyte/sec 14Mbyte/sec bonnie++ write 17.5Mbyte/sec 18Mbyte/sec bonnie++ rewrite 5.6Mbyte/sec 5.8Mbyte/sec bonnie++ read 24Mbyte/sec 24.5Mbyte/sec kernel stress build 212min24s 229m54s linear swap test 1m30s 2m15s bonnie++ creat() 7200 9600 [*] bonnie++ stat() 2100 9000 [*] bonnie++ unlink() 5300 30000 [*]
[*] either the ext2 directory optimization in 2.4.10ac is influencing the test, or 2.4.11pre2 VM has a problem caching inodes.
Comments + conclusions ----------------------
- The 2.4.11pre2 VM is considerably more stable, where "stable" is defined as repeatable test scores and consistent performance. The 2.4.10ac4 VM is all over the place.
- Both kernels exhibit similar interactive response under load.
- The 2.4.11pre2 VM performs substantially better in tests which invoke swapping.
- Surprisingly, the 2.4.10ac4 kernel does much much better at dbench. The 2.4.11pre2 performance is alleged to have regressed since 2.4.10pre10?
- I have not tried 2.4.11pre4, but the report of streaming i/o causing swapping is concerning.
Note that the above results were generated using a very simple (and extensible) script. VM developers would do well to spend the 30 seconds writing a similar script, and post results along with proposed VM patches.
Cheers Chris
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