* Mark Brown <[EMAIL PROTECTED]> [011213 17:35] wrote:
> Does anyone know if there is a significant performance gain to maintaining
> scatter/gather lists with uio rather than writing the s/g routine yourself.
>
> To be more specific:
> I currently have a routine that takes a memory segments and places them in a
> contiguous memory buffer. We need to optimize the routine for better CPU
> utilization. We currently get the memory list and organize it using memcopy.
> I would like to use uiomove but it is hard to justify the time needed to
> convert the current routine to uiomove if there is only a insignificant
> performance gain. Keep in mind this routine is being called frequently.
>
> I would like to justify to my boss that using uiomove would have significant
> performance benefits over our current routine that uses memcopy.
Uh.......
If you have a routine using memcpy then you're effectively making the
UIO as you go, making the additional copy is just stupid.
It should be trivial to convert the routine and I strongly suggest
doing so.
--
-Alfred Perlstein [[EMAIL PROTECTED]]
'Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.'
http://www.morons.org/rants/gpl-harmful.php3
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
