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

[Andi Kleen]

Thomas Hellstrom <thellstrom@xxxxxxxxxx> writes:

> 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
> may be catastrophical on systems with large caches. Therefore use clflush()

may be? You seem to miss some hard data here.

I wouldn't expect wbinvd to take longer than a ms or two, which 
is probably not catastrophic yet.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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