On Thu, Jan 26, 2012 at 05:06:42PM -0800, Richard Sharpe wrote: > Why do I see such a big performance difference? Does writing to the > device also use the page cache if I don't specify DIRECT IO? Yes. Trying adding conv=fdatasync to both versions to get more realistic results. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
