Re: regarding generic AIO, async syscalls precedent + some benchmarksby lighttpd

[Christopher Smith]

Davide Libenzi wrote:
> Yes, that is some very interesting data IMO. I did not bench the GUASI 
> (userspace async thread library) against AIO, but those numbers show that a 
> *userspace* async syscall wrapper interface performs in the ballpark of AIO.
> This leads to some hope about the ability to effectively deploy the kernel 
> generic async AIO (being it fibril or kthreads based) as low-impact async 
> provider for basically anything.
>   

SGI's kaio patch to linux kind of went that route (using kthreads) for 
non-SCSI async IO. It wasn't a bad way to go, but at least for 
disk-based access they achieved much better results when they could go 
right to the hardware.

--Chris
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