Re: [Lsf10-pc] Current topics for LSF10/MM Summit 8-9 August in Boston

J. Bruce Fields
2010-06-18T12:18:34Z

On Thu, Jun 17, 2010 at 11:07:30AM -0500, James Bottomley wrote:
> It's actually listed under 'dma issues' ... but there's really been no
> satisfactory resolution or discussion of how one might be achieved.
> Most filesystems rely on modifications to in-flight pages for efficiency
> and copying every fs I/O page would be horrendous both for performance
> and memory consumption. Nor has there really been an indication that
> it's a serious issue. The two sufferers are DIF and iSCSI checksum.

And, again, NFS (both client (on writes) and server (on reads)), when
using sec=krb5i. Haven't tried to reproduce the problem, but I believe
it would result in spurious IO errors.

--b.