On Thu, 21 Jun 2001, Neil Brown wrote:
>
> As I mentioned earlier, my testing shows substantial improvements
> from these three patches for both sequential (bonnie) and random
> (dbench) access patterns. I would be particularly interested if
> anyone else does any different testing, preferable comparing
> 2.2.19+patches with 2.4.5 and then with 2.4.5-plus these patches.
>
Here are my results testing on a dual PII-350 with 512MB Ram (Asus P2B-DS)
and 4 old 5400 SCSI UW disks (3 x 2GB and 1 4GB disks) and 2 newer 7200
45GB IBM IDE disks, giving me a total of 6 disks for Raid 5:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1 1536 4677 99.9 12590 16.8 7832 15.7 4478 96.4 29840 35.4 212.5 4.8
2 1536 4935 99.9 25557 41.5 10011 18.1 4586 97.1 30195 29.2 216.7 4.4
3 1536 4620 98.2 19432 33.5 10492 41.5 4547 95.5 27021 23.7 251.4 3.4
1 - 2.4.5 no patch
2 - 2.4.5 with Neil patch set
3 - 2.2.19+patches
There is a big improvement in write performance and CPU usage for reading
went down. The only area where 2.2 is still faster is in random seeks.
(Note: I did NOT do these tests on a fresh new filesystem.)
Then I did a second test where about 130 process copy some 9000 files
(size of about 100 files is 1.4MB up to 8MB, the rest is 2KB), via
FTP in a circle. Some of the files are duplicated and then deleted.
For each file send by any process there is a log entry, so there is
a lot of small disk activity. The test was always run for 30 minutes.
Machine Files send Bytes send Connections
1 647494 2.59 GB 2840 => 359.72 fps 1.47 MB/s
2 647310 3.02 GB 3951 => 359.62 fps 1.72 MB/s
3 573228 1.90 GB 1123 => 318.46 fps 1.08 MB/s
fps - files per second
1 - 2.4.5 no patch
2 - 2.4.5 with Neil patch set
3 - 2.2.19+patches
So here too, the patch improved performance at least for the larger files.
The results for the number of files did not improve, but this is because
of the higher number of FTP connections.
Did these patches already go into Linus 2.4.6-pre tree?
Thank you for these great patches!
Holger
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to [EMAIL PROTECTED]
