Messages in this thread | | | Date | Wed, 12 Sep 2012 08:12:40 +0900 | Subject | Re: [PATCH 1/2] writeback: add dirty_background_time per bdi variable | From | Namjae Jeon <> |
| |
>> >> To be frank, no realistic NFS servers will use USB disk as backing >> storage. So that rational for reducing "initial" delays is weak. >> Continuous write performance to HDD is much more important. Do you >> have numbers for that? > > Actually, we use USB HDD and USB Flash devices at NFS server. > There can be other similar users as well. So it might be useful to > provide this tuning feature other. > As default value is zero, it is disabled by default and it should not > impact normal writeback. > > I will share large file writes test result on NFS client on USB HDD > with/without tuning with patch. Hi. Wu. I share 1GB continous write test result.
-> create a 1000 MB file For continuous write - create 1 GB file
RecSize WriteSpeed 10485760 10.47MB/sec 1048576 10.35MB/sec 524288 10.48MB/sec 262144 10.48MB/sec 131072 10.52MB/sec 65536 10.56MB/sec 32768 10.64MB/sec 16384 10.31MB/sec 8192 10.52MB/sec 4096 10.45MB/sec
I will update changelog in patch.
Thanks Wu!.
| |