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From: Robert Watson <rwatson@FreeBSD.org>
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To: Kris Kennaway <kris@FreeBSD.org>
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Cc: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	Mike Silbersack <silby@silby.com>,
	Alfred Perlstein <alfred@freebsd.org>, cvs-all@FreeBSD.org,
	Jeff Roberson <jroberson@chesapeake.net>
Subject: Re: cvs commit: src/sys/conf NOTES files options src/sys/dev/acpica
 acpi_ec.c src/sys/kern kern_ktrace.c kern_rwlock.c kern_sx.c
 kern_thread.c
 subr_sleepqueue.c subr_turnstile.c src/sys/netinet6 in6_src.c src/sys/sys
 _rwlock.h _sx.h lock_profile.h proc.h ...
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On Wed, 5 Sep 2007, Kris Kennaway wrote:

> Mike Silbersack wrote:
>> 
>> On Wed, 5 Sep 2007, Kris Kennaway wrote:
>> 
>>> Check my slides from the devsummit, at
>>> 
>>> http://people.freebsd.org/~kris/scaling/Scalability%20Update.pdf
>>> 
>>> Most of the improvement to mysql on 7.0 came from fixed sx locks and 
>>> converting filedesc to use them.
>> 
>> I can't remember.  Are filedesc locking improvements helpful to only 
>> threaded apps, or do non-threaded apps benefit as well?
> 
> Threaded.

They actually may also lower the overhead for non-threaded apps to perform 
some operations, but the difference won't be nearly as dramatic as for 
threaded applications that pound the file descriptor array heavily.

Robert N M Watson
Computer Laboratory
University of Cambridge