Re: [PATCH] x86: Use clflush() instead of wbinvd() whenever possiblewhen changing mapping

[Thomas Hellström]

Pavel Machek skrev:
> On Fri 2009-07-24 09:53:01, Thomas Hellstrom wrote:
>   
> > The current code uses wbinvd() when the area to flush is > 4MB. Although this
> > may be faster than using clflush() the effect of wbinvd() on irq
> > latencies
> >     
>
> You are slowing the kernel down, and you did not write down the
> reasons. bad.
>
>   
I may slow the kernel down or speed it up depending on your hardware 
configuration. The reasons should be quite obvious if you read the 
discussion following the patch.

/Thomas

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