From: Steve Dickson <SteveD@redhat.com>
To: Andrew Holway <a.holway@syseleven.de>
Cc: kvm@vger.kernel.org, libvir-list@redhat.com, linux-nfs@vger.kernel.org
Subject: Re: NFS over RDMA small block DIRECT_IO bug
Date: Tue, 11 Sep 2012 13:03:37 -0400 [thread overview]
Message-ID: <504F6EE9.5070908@RedHat.com> (raw)
In-Reply-To: <F416961E-A33A-44D3-A788-5EF598A0AAFE@syseleven.de>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Steve Dickson <SteveD-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Andrew Holway <a.holway-V6oZj8nR2NRn68oJJulU0Q@public.gmane.org>
Cc: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
libvir-list-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: NFS over RDMA small block DIRECT_IO bug
Date: Tue, 11 Sep 2012 13:03:37 -0400 [thread overview]
Message-ID: <504F6EE9.5070908@RedHat.com> (raw)
In-Reply-To: <F416961E-A33A-44D3-A788-5EF598A0AAFE-V6oZj8nR2NRn68oJJulU0Q@public.gmane.org>
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.
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next prev parent reply other threads:[~2012-09-11 17:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 9:31 NFS over RDMA small block DIRECT_IO bug Andrew Holway
2012-09-04 12:04 ` Myklebust, Trond
2012-09-04 12:04 ` Myklebust, Trond
2012-09-04 12:52 ` Andrew Holway
2012-09-05 14:02 ` Avi Kivity
2012-09-05 14:02 ` Avi Kivity
2012-09-06 10:14 ` Andrew Holway
2012-09-06 13:45 ` Myklebust, Trond
2012-09-06 13:45 ` Myklebust, Trond
2012-09-11 17:03 ` Steve Dickson [this message]
2012-09-11 17:03 ` Steve Dickson
2012-09-18 14:03 ` Andrew Holway
2012-09-18 14:03 ` Andrew Holway
2012-09-19 15:50 ` Steve Dickson
2012-09-19 15:50 ` Steve Dickson
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