RE: [Xen-devel] Large IO Waits for srm.

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> nic@sea:/backup$ w
>  17:26:16 up  4:21,  1 user,  load average: 1.00, 1.00, 0.92
> USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
> nic      pts/1    base-one.kiwa.co 17:22    0.00s  0.01s  0.00s w
> 
> The large IO wait level seems more than it should be. Here is 
> an IDE based non Xen system doing the same.

I wouldn't necessarily trust the iowait time to be correctly accounted.
Does the srm delete take noticeably longer? 

What happens if you do some simple tests to measure 'dd' performance in
both dom0 and the domU?

Best,
Ian 
 
> nic@lode:/home/bak$ vmstat 3
> procs -----------memory---------- ---swap-- -----io---- 
> --system-- ----cpu----
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in  
>   cs us sy id wa
>  0  1  41984  57352   5856 352988    0    0     3     4    1  
>    2  1  0 98  1
>  1  1  41984  56264   5880 353000    0    0     1 24937 2584  
> 5174  1 29  0 69
>  1  0  41984  56264   5880 353020    0    0     0  6161 1417  
> 1073  0 81  0 18
>  1  0  41984  56208   5896 353052    0    0    11  1279 1106  
>  462  0 97  0  3
>  1  0  41984  56216   5904 353056    0    0     0  1256 1104  
>  457  0 97  0  3
>  1  0  41984  56216   5904 353068    0    0     0  1282 1120  
>  457  0 97  0  3
> 
> 
> Nicholas
> 
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