Hello KK,

	Could you please try TCP_RRs as well?

Thanks
Shirley


                                                                           
             Krishna Kumar2                                                
             <krkumar2@in.ibm.                                             
             com>                                                       To 
                                       "Michael S. Tsirkin"                
             05/26/2011 08:32          [off-list ref]                    
             AM                                                         cc 
                                       Christian Borntraeger               
                                       [off-list ref], Carsten   
                                       Otte [off-list ref],            
                                       habanero@linux.vnet.ibm.com, Heiko  
                                       Carstens                            
                                       [off-list ref],        
                                       kvm@vger.kernel.org,                
                                       lguest@lists.ozlabs.org,            
                                       linux-kernel@vger.kernel.org,       
                                       linux-s390@vger.kernel.org,         
                                       linux390@de.ibm.com,                
                                       netdev@vger.kernel.org, Rusty       
                                       Russell [off-list ref],    
                                       Martin Schwidefsky                  
                                       [off-list ref], Steve     
                                       Dobbelstein/Austin/IBM@IBMUS, Tom   
                                       Lendacky [off-list ref], 
                                       virtualization@lists.linux-foundati 
                                       on.org, Shirley                     
                                       Ma/Beaverton/IBM@IBMUS              
                                                                   Subject 
                                       [PERF RESULTS] virtio and vhost-net 
                                       performance enhancements            
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




"Michael S. Tsirkin" [off-list ref] wrote on 05/20/2011 04:40:07 AM:

OK, here is the large patchset that implements the virtio spec update
that I sent earlier (the spec itself needs a minor update, will send
that out too next week, but I think we are on the same page here
already). It supercedes the PUBLISH_USED_IDX patches I sent
out earlier.

I was able to get this tested by applying the v2 patches
to git-next tree (somehow MST's git tree hung on my guest
which never got resolved). Testing was from Guest -> Remote
node, using an ixgbe 10g card. The test results are
*excellent* (table: #netperf sesssions, BW% improvement,
SD% improvement, CPU% improvement):

___________________________________
           512 byte I/O
#     BW%     SD%      CPU%
____________________________________
1     151.6   -65.1    -10.7
2     180.6   -66.6    -6.4
4     15.5    -35.8    -26.1
8     1.8     -28.4    -26.7
16    3.1     -29.0    -26.5
32    1.1     -27.4    -27.5
64    3.8     -30.9    -26.7
96    5.4     -21.7    -24.2
128   5.7     -24.4    -25.5
____________________________________
BW: 16.6%   SD: -24.6%    CPU: -25.5%


____________________________________
            1K I/O
#     BW%     SD%      CPU%
____________________________________
1     233.9   -76.5    -18.0
2     112.2   -64.0    -23.2
4     9.2     -31.6    -26.1
8    -1.7     -26.8    -30.3
16    3.5     -31.5    -30.6
32    4.8     -25.2    -30.5
64    5.7     -31.0    -28.9
96    5.3     -32.2    -31.7
128   4.6     -38.2    -33.6
____________________________________
BW: 16.4%   SD: -35.%    CPU: -31.5%


____________________________________
             16K I/O
#     BW%     SD%      CPU%
____________________________________
1     18.8    -27.2    -18.3
2     14.8    -36.7    -27.7
4     12.7    -45.2    -38.1
8     4.4     -56.4    -54.4
16    4.8     -38.3    -36.1
32    0        78.0     79.2
64    3.8     -38.1    -37.5
96    7.3     -35.2    -31.1
128   3.4     -31.1    -32.1
____________________________________
BW: 7.6%   SD: -30.1%   CPU: -23.7%


I plan to run some more tests tomorrow. Please let
me know if any other scenario will help.

Thanks,

- KK