Can I use VFP in work queue context ?

Woodruff, Richard r-woodruff2 at
Thu Apr 22 15:33:37 EDT 2010

> From: Nicolas Pitre [mailto:nico at]
> Sent: Thursday, April 22, 2010 12:20 PM

> > If the work queue executes in a unique context it could follow the
> > same lazy strategy a user space one does.
> It could... but that begs the question: what is this that requires so
> much processing power within the kernel?  This really needs to be fully
> understood and justified before even considering a possible VFP usage in
> the kernel.

A simple candidate is Neon memory copy. It can perform much better than the ARM based one. There are a few unfortunate copies associated with some networking devices which see decent benefit.

Richard W.

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