Re: [Xen-devel] [PATCH 1/3] qemu-xen-traditional: use O_DIRECT to open disk images for IDE

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Stefano Stabellini writes ("RE: [Xen-devel] [PATCH 1/3] qemu-xen-traditional: 
use O_DIRECT to open disk images for IDE"):
> On Tue, 27 Mar 2012, Zhang, Yang Z wrote:
> > Doesn't cache mode have better performance than NOCACHE?
> 
> Actually you are correct. I think that this patch should be dropped from
> the series. Of course we need O_DIRECT for QDISK otherwise we do loose
> correctness but considering that IDE should only be used during
> installation it can stay as it is.

I don't think this assumption about IDE is correct.  To say that "IDE
should only be used during installation" is not an excuse for
providing an IDE controller which violates the usual correctness
rules.

Ian.

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