On Wed, Dec 10, 2008 at 12:07 PM, Davide Cittaro <davide.cittaro at ifom-ieo-campus.it> wrote: > Hi all, I'm migrating from Gentoo to CentOS... I'm experiencing a > rather low performance in NFS r/w (as client). > NFS server is solaris (which exports zfs volumes via nfs). The very > same exports were mounted with the same parameters (auto,nosuid,exec) > on gentoo and centos server (bot x86_64)... It happens that centos is > 5-10 times slower either in read and write operations... Ok, I'll try > to tune rsize and wsize, but does anybody have an hint on this low > performance? > Which version of CentOS are you using? The upstream kernels have had issues at different points with NFS performance (the 2.6.18 had a bunch of problems that were fixed in 2.6.20-22 time frame and have had to be backported.. then there were changes and breakage somewhere after that.. ) I normally try a set of comparisons: 1) What does CentOS-4 do? What does CentOS-5 do? 4 may actually be faster than 5 in some cases due to switch/card issues. 2) Then there are issues with TCP, size of frames, etc... -- Stephen J Smoogen. -- BSD/GNU/Linux How far that little candle throws his beams! So shines a good deed in a naughty world. = Shakespeare. "The Merchant of Venice"