Messages in this thread | | | Date | Wed, 27 Aug 2008 15:23:14 -0700 (PDT) | Subject | Re: loaded router, excessive getnstimeofday in oprofile\ | From | David Miller <> |
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From: Andi Kleen <andi@firstfloor.org> Date: Wed, 27 Aug 2008 20:32:16 +0200
> > Doing the expensive timestamping in a possibly delayed thread (ie some > > milliseconds > > after hardware notification) is wrong/useless. > > We had this discussion earlier, please review the thread I linked to. > > Note that interrupts can be arbitarily delayed too (both by cli > and by interrupt mitigation), even on a non RT kernel.
This is a much different kind of delay compared to sleeping for seconds or longer on the socket lock while a GFP_KERNEL allocation is being satisfied by swapping tons of crap out to disk.
Your socket solution is not a workable scheme.
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