Re: Performance of ext4

Andreas Dilger
2008-06-19T06:58:58Z

On Jun 18, 2008 05:58 +0000, Holger Kiehl wrote:
> 1.03 ------Sequential Output------ --Sequential Input- --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> ext4 K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
> 16G 52133 98 221378 95 106873 32 55707 99 297065 42 1546 4
> 16G 52042 98 220931 93 107715 32 55939 98 298810 42 1543 3
> 16G 52975 98 220976 93 108060 31 56426 98 298906 42 1452 4
>
>ext4(patchqueue)16G 59727 98 252733 52 110177 25 55821 98 296739 42 1553 5
>> 16G 61047 99 239242 48 111664 25 55706 98 297151 42 1545 4
>> 16G 60503 99 241532 47 109655 25 55671 98 297648 42 1552 3
>
> I forgot to mention that for bonnie ext4-patch-queue reduces CPU-load
> a lot. For block writting it is nearly halved.

That was the main reason for developing mballoc. With this patch it
would be able to drive almost 500MB/s write, 600MB/s read on the above
system instead of being CPU limited at 250/300MB/s.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.