Re: [libvirt] NFS over RDMA small block DIRECT_IO bug

On 09/04/2012 05:31 AM, Andrew Holway wrote: > Hello. > > # Avi Kivity avi(a)redhat recommended I copy kvm in on this. It would also seem relevent to libvirt. # > > I have a Centos 6.2 server and Centos 6.2 client. > > [root@store ~]# cat /etc/exports > /dev/shm 10.149.0.0/16(rw,fsid=1,no_root_squash,insecure) (I have tried with non tempfs targets also) > > > [root@node001 ~]# cat /etc/fstab > store.ibnet:/dev/shm /mnt nfs rdma,port=2050,defaults 0 0 > > > I wrote a little for loop one liner that dd'd the centos net install image to a file called 'hello' then checksummed that file. Each iteration uses a different block size. > > Non DIRECT_IO seems to work fine. DIRECT_IO with 512byte, 1K and 2K block sizes get corrupted. > > I want to run my KVM guests on top of NFS over RDMA. My guests cannot create filesystems. > > Thanks, > > Andrew. > > bug report: https://bugzilla.linux-nfs.org/show_bug.cgi?id=228 Well it appears the RHEL6 kernels are lacking a couple patches that might help with this.... 5c635e09 RPCRDMA: Fix FRMR registration/invalidate handling. 9b78145c xprtrdma: Remove assumption that each segment is <= PAGE_SIZE I can only image that Centos 6.2 might me lacking these too... ;-) steved. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html