UNIX domain sockets MFC's

[Robert Watson]

On Fri, 11 May 2007, Abdullah Ibn Hamad Al-Marri wrote:

> On 5/11/07, Robert Watson <rwatson at freebsd.org> wrote:
>> On Tue, 8 May 2007, Robert Watson wrote:
>> 
>> > Right now I am tracking two known issues with UNIX domain sockets in
>> > RELENG_6:
>> >
>> > - Reported NULL point derference in unp_connect(), which occurs due to 
>> the
>> >  dropping of locks around sonewconn().  This is fixed in HEAD, and I am
>> >  preparing an MFC of this patch.
>> 
>> The fix for this has now been merged as 1.155.2.22.  As there have been no 
>> new reports of UNIX domain socket problems in the last couple of days, it 
>> sounds like the MFC of the last batch of fixes and cleanups has not lead to 
>> problems.
>
> I updated my server which has dual CPU with SMP one hour ago, and I didn't 
> see any speed improvement in the MySQL.

The speed improvements associated with these MFC's is minor; primarily they 
are stability improvements under high load.  There are major performance 
improvements in the 7.x implementation, especially for multi-core systems, but 
I have no current plans to MFC them, as they interact with other system 
components and may depend on other changes that also haven't been MFC'd.

Robert N M Watson
Computer Laboratory
University of Cambridge