2009/6/29 Wu Fengguang <fengguang.wu@xxxxxxxxx>: > On Mon, Jun 29, 2009 at 09:13:27PM +0800, Wu Fengguang wrote: >> On Mon, Jun 29, 2009 at 09:04:57PM +0800, Vladislav Bolkhovitin wrote: >> > Wu Fengguang, on 06/29/2009 04:54 PM wrote: >> > > >> > > Why not 2.6.30? :) >> > >> > We started with 2.6.29, so why not complete with it (to save additional >> > Ronald's effort to move on 2.6.30)? >> >> OK, that's fair enough. > > btw, I backported the 2.6.31 context readahead patches to 2.6.29, just > in case it will help the SCST performance. > > Ronald, if you run context readahead, please make sure that the server > side readahead size is bigger than the client side readahead size. I tried this patch on a vanilla kernel and no other patches applied, but it does not seem to help. The iSCSI throughput does not go above 60MB/s. (1GB in 17 seconds). I have tried several readahead settings from 128KB up to 4MB and kept the server readahead at twice the client readahead, but it never comes above 60MB/s. This is using SCST on the serverside and openiscsi on the client. I get much better throughput (90 MB/s) when using the patches supplied with SCST, together with the blk_run_backing_dev readahead patch. Ronald. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
