Hi Shehjar, Can you provide the exact dd command you are running both locally and for the NFS mount? -Tommy On Wed, Nov 3, 2010 at 11:33 AM, Joe Landman <joe.landman@xxxxxxxxx> wrote: > On 11/03/2010 01:58 PM, Shehjar Tikoo wrote: >> >> Hi All, >> >> I am running into a performance problem with 2.6.32-23 Ubuntu lucid on >> both client and server. >> >> The disk is an SSD performing at 1.4 - 1.6Gbps for a dd of a 6gb file in >> 64k blocks. >> > > If the size of this file is comparable to or smaller than the client or > server ram, this number is meaningless. > >> The network is performing fine with many Gbps of iperf throughput. >> > > GbE gets you 1 Gbps. 10GbE may get you from 3-10 Gbps, depending upon many > things. What are your numbers? > >> Yet, the dd write performance over the nfs mount point ranges from 96-105 >> Mbps for a 6gb file in 64k blocks. >> > > Sounds like you are writing over the gigabit, and not the 10GbE interface. > >> I've tried changing the tcp_slot_table_entries and the wsize but there is >> negligible gain from these. >> >> Does it sound like a client side inefficiency? >> > > Nope. > > -- > Joseph Landman, Ph.D > Founder and CEO > Scalable Informatics Inc. > email: landman@xxxxxxxxxxxxxxxxxxxxxxx > web : http://scalableinformatics.com > phone: +1 734 786 8423 x121 > fax : +1 866 888 3112 > cell : +1 734 612 4615 > -- > 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 > -- 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
