Unix Programming - Re: socket programming using MSG

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Re: socket programming using MSG_WAITALL for receiving multicast

David Schwartz

2008-03-20, 7:15 pm

On Mar 20, 4:23 pm, jiangxu...@gmail.com wrote:

> I am receiving high bit rate streamming data such as Video data. I
> think it will be more efficient with less context switch between
> kernel and user space.

Don't worry, the scheduler agrees with you. When efficiency matters,
there will be less context switching.

> So if the kernel can accumulate more packets
> before wake up the function, it should be more CPU efficient, right?

Right, and that's exactly what the kernel will do, all by itself.

If you test with no load, you will get lots of context switches. This
is fine -- you can't save CPU in a jar to use later. As soon as the
load goes up, the system will spend time doing other things and by the
time your process gets to run, more packets will be accumulated as if
by magic.

Don't try to "fix" the scheduler. It's not broken.

DS

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