Of course fragmentation doesn't matter if there is no data IO...You true...I usually got significant performance with rszie/wsize around 4K, while MTU was at 1.5 k.....As you said right balance between the performance gains at the RPC/UDP stack and fragmentation overhead at L3/L2 stack.... May be you can try adding more threads on the server, and if it is MIPIO capable, you can find better performance....and lastly NFS is not meant for performance...Until you use NFSoRDMA pr pNFS....As Chuck mentioned, sequential LOG based file systems based NFS server offer better performance at a server storage level.. And if you have a real need, i have created an NFS load balancer that brings superior performance(better than local FS for large meta data intensive workloads or IO is spread to different files) for my previous employer...You can find more details here.. Its not open source...But i can have them contact you and give you a trial version... http://www.calsoftlabs.com/whitepapers/net-nfs.html thanks On Thu, Sep 3, 2009 at 12:40 AM, Aaron Wiebe<epiphani@xxxxxxxxx> wrote: > On Wed, Sep 2, 2009 at 2:35 PM, Peter Chacko<peterchacko35@xxxxxxxxx> wrote: >> Is this NFSv4 ? rsize and wsize > MTU size will cause fragmentation >> and performance issues...Try making it around 4k .....You used 1<<15 >> fir your example. if you don't do writes....then this shouldn't >> matter...and of course NFS is Nfs is not For Scalability.. You cannot >> get the same performance on NFS as you would get for localFS...May be >> you can try 10g....still there is TCP/UDP/IP stack overhead..... > > Fragmentation won't hurt you that much, and it doesn't even apply to > opens, since those operations are significantly smaller. The > performance gains higher in the stack from a larger rsize/wsize > generally outweigh the savings in frame size optimization. Of course, > jumbo frames are always a good idea, but again, doesn't help here. > > -Aaron > -- Best regards, Peter Chacko NetDiox computing systems, Network storage & OS training and research. Bangalore, India. www.netdiox.com 080 2664 0708 -- 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
