On Tue, 2010-03-02 at 11:10 +0800, Wu Fengguang wrote: > Dave, > > Here is one more test on a big ext4 disk file: > > 16k 39.7 MB/s > 32k 54.3 MB/s > 64k 63.6 MB/s > 128k 72.6 MB/s > 256k 71.7 MB/s > rsize ==> 512k 71.7 MB/s > 1024k 72.2 MB/s > 2048k 71.0 MB/s > 4096k 73.0 MB/s > 8192k 74.3 MB/s > 16384k 74.5 MB/s > > It shows that >=128k client side readahead is enough for single disk > case :) As for RAID configurations, I guess big server side readahead > should be enough. There are lots of people who would like to use NFS on their company WAN, where you typically have high bandwidths (up to 10GigE), but often a high latency too (due to geographical dispersion). My ping latency from here to a typical server in NetApp's Bangalore office is ~ 312ms. I read your test results with 10ms delays, but have you tested with higher than that? Cheers Trond -- 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
