[Xen-users] TAP:AIO much slower then file: ?!

[MS <ms@xxxxxxxxxx>]

Hi!

i checked the io performance with bonnie++ on an domU.
With "file:" i get a goot result (nearly the dom0 results):

Version  1.03       ------Sequential Output------ --Sequential Input- 
--Random-
                   -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  
/sec %CP
server123      440M 52335  93 46364   3 214480   0 54105  77 709159   0 
+++++ +++
                   ------Sequential Create------ --------Random 
Create--------
                   -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
             files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  
/sec %CP
                16 20533  36 +++++ +++ 19130  10 23464  49 +++++ +++ 
16243  14
server123,440M,52335,93,46364,3,214480,0,54105,77,709159,0,+++++,+++,16,20533,36,+++++,+++,19130,10,23464,49,+++++,+++,16243,14



Then i try the same with just changed to "tap:aio:" and i get a much 
slower result:
Version  1.03       ------Sequential Output------ --Sequential Input- 
--Random-
                   -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- 
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  
/sec %CP
server123      440M  2125   3  2202   0  1907   0 28110  28 21798   0 
13024   0
                   ------Sequential Create------ --------Random 
Create--------
                   -Create-- --Read--- -Delete-- -Create-- --Read--- 
-Delete--
             files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  
/sec %CP
                16   197   0 +++++ +++   179   0   200   0 +++++ +++   
160   0
server123,440M,2125,3,2202,0,1907,0,28110,28,21798,0,13023.9,0,16,197,0,+++++,+++,179,0,200,0,+++++,+++,160,0




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