diff options
Diffstat (limited to 'qemu-img.texi')
| -rw-r--r-- | qemu-img.texi | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/qemu-img.texi b/qemu-img.texi index ccc0b519ba..cbe50e9b88 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -131,7 +131,7 @@ Skip the creation of the target volume Command description: @table @option -@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-o @var{offset}] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-S @var{step_size}] [-t @var{cache}] [-w] @var{filename} +@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [--flush-interval=@var{flush_interval}] [-n] [--no-drain] [-o @var{offset}] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-S @var{step_size}] [-t @var{cache}] [-w] @var{filename} 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. @@ -142,6 +142,12 @@ starts at the position given by @var{offset}, each following request increases the current position by @var{step_size}. If @var{step_size} is not given, @var{buffer_size} is used for its value. +If @var{flush_interval} is specified for a write test, the request queue is +drained and a flush is issued before new writes are made whenever the number of +remaining requests is a multiple of @var{flush_interval}. If additionally +@code{--no-drain} is specified, a flush is issued without draining the request +queue first. + 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. |