Francois Caen wrote:
On 9/30/06, Kirk Bocek <t004@xxxxxxxxxx> wrote:
Whoa! Block writes jumped to 130MB/Sec with no other changes. XFS Rocks!
Too bad it's not supported and QA'd by the upstream vendor and
therefore shouldn't be used in production on CentOS :-(
Well hey! I think the downstream vendor rocks too! And it sounds like
centosplus has done some defacto QA too. :)
Doing some further benchmarking, I added 'blockdev --setra 32768 /dev/sdb' to
my previous setup and ran a bunch of benchmarks overnight. The results:
------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
Beryl 50G:256k 58911 93 198971 36 57194 8 47548 73 166183 14 62.2 2
Beryl 50G:256k 60773 94 196980 36 56325 8 47719 74 166580 14 61.8 2
Beryl 50G:256k 59977 94 187017 36 55981 8 47975 74 165562 14 64.0 2
Beryl 50G:256k 60193 94 196472 36 56896 8 47913 74 166449 14 63.0 2
Beryl 50G:256k 59802 94 201524 38 56746 8 48084 75 168710 14 64.7 1
Beryl 50G:256k 60677 94 199188 37 52997 7 47682 74 163131 15 64.0 2
Beryl 50G:256k 60061 94 191342 37 55949 9 47794 74 165348 15 64.3 2
Beryl 50G:256k 60261 94 184231 35 56235 8 48090 74 166860 14 61.8 2
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
Beryl 16 3597 17 +++++ +++ 4088 18 3101 15 +++++ +++ 856 4
Beryl 16 3240 16 +++++ +++ 4561 20 3030 15 +++++ +++ 755 3
Beryl 16 3039 14 +++++ +++ 4446 20 3111 15 +++++ +++ 754 3
Beryl 16 3317 16 +++++ +++ 4509 21 2978 15 +++++ +++ 767 3
Beryl 16 5037 25 +++++ +++ 4801 20 3349 17 +++++ +++ 891 4
Beryl 16 3390 16 +++++ +++ 3341 14 3222 17 +++++ +++ 806 3
Beryl 16 3547 17 +++++ +++ 3700 16 2986 15 +++++ +++ 799 4
Beryl 16 3556 18 +++++ +++ 3183 13 3391 17 +++++ +++ 863 4
Block writes are still close to 200MB/Sec but block reads still haven't
changed from 166MB/Sec. :(
Anyone have any thoughts on increasing read speed other than using blockdev?
Kirk Bocek
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