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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>