Re: [Xen-devel] windows tmem

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx]
> Sent: 04 June 2013 04:09
> To: Paul Durrant; Konrad Rzeszutek Wilk
> Cc: xen-devel@xxxxxxxxxxxxx
> Subject: RE: [Xen-devel] windows tmem
> 
> >
> > Do you have any numbers for a more recent version of Windows? At least a
> > 6.x kernel. Perhaps the pageout characteristics are better?
> >
> 
> Fresh install of 2008r2 with 512kb of memory and tmem active, with updates
> installing for the last 30 minutes:
> 
> put_success_count = 1286906
> put_fail_count    = 0
> get_success_count = 511937
> get_fail_count    = 286789
> 
> a 'get fail' is a 'miss'.
> 

Hmm. On the face of it a much higher miss rate than 2K3, but the workload is 
different so it's hard to tell how comparable the numbers are. I wonder whether 
use of ephemeral tmem is an issue because of the get-implies-flush 
characteristic. I guess you'd always expect a put between gets for a pagefile 
but it might be interesting to see what miss rate you get with persistent tmem.

  Paul

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