I am using tiobench to test performance of an NFS mounted volume, and notice that Sequential Reads are much slower than Random Reads. This isn't the behavior when I run the same test on the disk mounted locally. For random reads I'm getting: 50 MB/s over NFS v.s 384 MB/s when mounted locally This is in comparison to the benchmark for _Random Reads_, in which I get: 288 MB/s both over NFS _and_ when directly mounted The other benchmarks seem to be in line with what I would expect, but I'm fairly new to NFS. Why would sequential reads over NFS be sooo much slower than random reads over NFS? I am exporting the volume on the server like this /export *.internal(no_subtree_check,rw,no_root_squash) and mounting with this: mount -o hard,intr,async,noatime,nodiratime,noacl $NFS_SERVER:/export /nfs Additionally I am doing all this in amazon EC2, exporting an EBS volume with the XFS file system (redundant, I know). I have tried using jumbo frames and various other mount options, but none seem to have much effect. Thanks for any clues. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
