diff options
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index b6b28e3542..c477fbf1c3 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -131,16 +131,21 @@ Skip the creation of the target volume Command description: @table @option -@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-q] [-s @var{buffer_size}] [-t @var{cache}] @var{filename} +@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-t @var{cache}] [-w] @var{filename} -Run a simple sequential read benchmark on the specified image. A total number -of @var{count} I/O requests is performed, each @var{buffer_size} bytes in size, -and with @var{depth} requests in parallel. +Run a simple sequential I/O benchmark on the specified image. If @code{-w} is +specified, a write test is performed, otherwise a read test is performed. + +A total number of @var{count} I/O requests is performed, each @var{buffer_size} +bytes in size, and with @var{depth} requests in parallel. If @code{-n} is specified, the native AIO backend is used if possible. On Linux, this option only works if @code{-t none} or @code{-t directsync} is specified as well. +For write tests, by default a buffer filled with zeros is written. This can be +overridden with a pattern byte specified by @var{pattern}. + @item check [-f @var{fmt}] [--output=@var{ofmt}] [-r [leaks | all]] [-T @var{src_cache}] @var{filename} Perform a consistency check on the disk image @var{filename}. The command can |