[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: linux-next regression: IO errors in with ext4 and xen-blkfront
In the barriers tree Xen claims to support flushes, but I doesn't. It never handles REQ_FLUSH requests. Try commenting out the blk_queue_flush(info->rq, info->feature_flush); call and things should improve. I still need to hear back from Xen folks how to actually implement a cache flush - they only implement a barrier write privilegue which could never implement an empty cache flush. Up to current kernels that meant it would implement barrier writes with content correctly and silently ignore empty barriers leading to very interesting data integrity bugs. From 2.6.37 onwards it simply won't work anymore at all, which is at least consistent (modulo the bug of actually claiming to support flushes). _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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