On Fri, 2007-08-03 at 14:37 +0200, Peter Zijlstra wrote: > Per device dirty throttling patches > > These patches aim to improve balance_dirty_pages() and directly address three > issues: > 1) inter device starvation > 2) stacked device deadlocks > 3) inter process starvation <snip> Hi Peter, I've been testing your patch with a simple test case that copies a 3GB file from sda -> sda, and copies a 1GB file from sda -> sdb. the script is roughly this :-
dd bs=64k if=[sda]/data3g of=[sda]/temp_data3g & sleep 60 dd bs=64k if=[sda]/data1g of=[sdb]/temp_data1g & wait sleep 200 On my amd64x2 desktop machine where sda is a sata 250 GB drive & sdb is an ide 300 GB drive. Running this test 5 times gives 2.6.23-rc1-mm2 1GB copy MB/s 3GB copy MB/s 16.2 16.1 15.2 14.6 17.3 14.6 18.0 14.5 19.0 14.6 2.6.23-rc1-mm2+pddt_patch 1GB copy MB/s 3GB copy MB/s 23.0 14.7 24.0 14.6 20.4 14.8 22.6 14.5 23.2 14.5 This is on a standard desktop machine so there are lots of other processes running on it, and although there is a degree of variability in the numbers,they are very repeatable and your patch always out performs the stock mm2. looks good to me Richard - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
