On 02/02/15 19:47, Paolo Bonzini wrote:

On 02/02/2015 17:44, Denis V. Lunev wrote:
+++ b/block/raw-posix.c
@@ -667,7 +667,8 @@ static void raw_refresh_limits(BlockDriverState *bs, Error 
**errp)
      BDRVRawState *s = bs->opaque;
raw_probe_alignment(bs, s->fd, errp);
-    bs->bl.opt_mem_alignment = s->buf_align;
+    bs->bl.min_mem_alignment = s->buf_align;
+    bs->bl.opt_mem_alignment = MAX(sysconf(_SC_PAGESIZE), s->buf_align);
This does not exist on Windows.  You have to use getpagesize(), for
which there is a wrapper in util/oslib-win32.c.

Paolo

      raw_probe_max_write_zeroes(bs);
cool suggestion, will do that. Thank you

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