Re: [RFC PATCH v9 00/16] Provide a zero-copy method on KVMvirtio-net.

[Shirley Ma]

On Tue, 2010-08-10 at 23:01 -0700, Shirley Ma wrote:
> On Tue, 2010-08-10 at 18:43 -0700, Shirley Ma wrote:
> > > Also I found some vhost performance regression on the new
> > > kernel with tuning. I used to get 9.4Gb/s, now I couldn't get it. 
> > 
> > I forgot to mention the kernel I used 2.6.36 one. And I found the
> > native
> > host BW is limited to 8.0Gb/s, so the regression might come from the
> > device driver not vhost.
> 
> Something is very interesting, when binding ixgbe interrupts to cpu1,
> and running netperf/netserver on cpu0, the native host to host
> performance is still around 8.0Gb/s, however, the macvtap zero copy
> result is 9.0Gb/s.
> 
> root@localhost ~]# netperf -H 192.168.10.74 -c -C -l60 -T0,0 -- -m 64K
> TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.10.74 (192.168..
> 10.74) port 0 AF_INET : cpu bind
> Recv   Send    Send                          Utilization       Service Demand
> Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
> Size   Size    Size     Time     Throughput  local    remote   local   remote
> bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
> 
>  87380  16384  65536    60.00      9013.59   53.01    8.21     0.963   0.597
> 
> Below is perf top output:
> 
>               578.00  6.5% copy_user_generic_string   
>               381.00  4.3% vmx_vcpu_run                
>               250.00  2.8% schedule                    
>               207.00  2.3% vhost_get_vq_desc           
>               204.00  2.3% _raw_spin_lock_irqsave      
>               197.00  2.2% translate_desc              
>               193.00  2.2% memcpy_fromiovec            
>               162.00  1.8% gup_pte_range   
> 
> We can compare your results with mine to see any difference.

When binding vhost thread to cpu3, qemu I/O thread to cpu2, macvtap zero
copy patch can get 9.4Gb/s. 

TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.10.74 (192.168.10.74) port 0 AF_INET : cpu bind
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB

 87380  16384  65536    60.00      9408.19   55.69    8.45     0.970   0.589

Shirley

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