[Lguest] [kvm-devel] [RFC PATCH 1/5] lguest: mmap backing file

[Avi Kivity]

Anthony Liguori wrote:
> Rusty Russell wrote:
>   
>> From: Paul TBBle Hampson <Paul.Hampson at Pobox.com>
>>
>> This creates a file in $HOME/.lguest/ to directly back the RAM and DMA memory
>> mappings created by map_zeroed_pages.
>>   
>>     
>
> I created a test program recently that measured the latency of a 
> reads/writes to an mmap() file in /dev/shm and in a normal filesystem.  
> Even after unlinking the underlying file, the write latency was much 
> better with a mmap()'d file in /dev/shm.
>   

Surely the difference disappears once the pages have been faulted in?


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