Re: loaded router, excessive getnstimeofday in oprofile

[David Miller]

From: Denys Fedoryshchenko <denys@xxxxxxxxxxx>
Date: Thu, 28 Aug 2008 19:48:52 +0300

> So there is few good solutions available (IMHO):
> 1)Introduce some SO_REALTIMESTAMP (anyway even SO_TIMESTAMP not defined in any 
> standard) for banks and ntp folks, who need them. And even give them timespec 
> instead timeval, so they will be even more happy with resolution.
> 2)Provide sysctl,kernel boot, or even "build time" option for "banks" to have 
> high resolution(and expensive) SO_TIMESTAMP.

The performance hit hurts, but changing the default to lower
resolution after it having been high resolution for 10+ years
is a regression and something we really can't do.
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