linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Date:	Thu, 22 Feb 2007 13:30:39 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	mingo@...e.hu, johnpol@....mipt.ru, arjan@...radead.org,
	drepper@...hat.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, hch@...radead.org, akpm@....com.au,
	alan@...rguk.ukuu.org.uk, suparna@...ibm.com,
	davidel@...ilserver.org, jens.axboe@...cle.com, tglx@...utronix.de
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

> The more I think about it, a reasonable solution might actually be to
> use threadlets for disk I/O and pure event based processing for
> networking.  It is two different handling paths and non-unified,
> but that might be the price for good performance :-)

I generally agree, with some comments.

If we come to the decision that there are some message rates that are  
better suited to delivery into a user-read ring (10gige rx to kevent,  
say) then it doesn't seem like it would be much of a stretch to add a  
facility where syslet completion could be funneled into that channel  
as well.

I also wonder if there isn't some opportunity to cut down the number  
of syscalls / op in networking land.  Is it madness to think of a  
call like recvmsgv() which could provide a vector of msghdrs?  It  
might not make sense, but it might cut down on the per-op overhead  
for loads that know they're going to be heavy enough to get a decent  
amount of batching without fatally harming latency.  Maybe those  
loads are rare..

- z 
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