Re: [Qemu-discuss] Understanding QEMU Cache Modes and Emulated Disk Write Cache

[wyang]

On 2016年08月17日 15:50, Fam Zheng wrote:
> I am confused about the difference between the guest disk write cache and the
> host page cache. Aren't these effectively the same (in both cases storing the
> dirty data in the host's RAM)? Is there a difference between how one gets
> Yes they are the same thing.
>
> Fam
Fam, if they are the same thing, how to understand "cache=none" as the 
host page cache is disabled and guest disk write cache is enabled for 
the guest when setting none?

http://www.ibm.com/support/knowledgecenter/linuxonibm/liaat/liaatbpkvmguestcache.htm

Thanks
Wei