From owner-freebsd-performance@FreeBSD.ORG  Thu May 11 13:54:12 2006
Return-Path: <owner-freebsd-performance@FreeBSD.ORG>
X-Original-To: performance@freebsd.org
Delivered-To: freebsd-performance@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 567A216A454;
	Thu, 11 May 2006 13:54:12 +0000 (UTC)
	(envelope-from rwatson@FreeBSD.org)
Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42])
	by mx1.FreeBSD.org (Postfix) with ESMTP id A2DBF43D9F;
	Thu, 11 May 2006 13:54:08 +0000 (GMT)
	(envelope-from rwatson@FreeBSD.org)
Received: from fledge.watson.org (fledge.watson.org [209.31.154.41])
	by cyrus.watson.org (Postfix) with ESMTP id 927E846CD3;
	Thu, 11 May 2006 09:54:06 -0400 (EDT)
Date: Thu, 11 May 2006 14:54:06 +0100 (BST)
From: Robert Watson <rwatson@FreeBSD.org>
X-X-Sender: robert@fledge.watson.org
To: David Xu <davidxu@freebsd.org>
In-Reply-To: <200605100726.28243.davidxu@freebsd.org>
Message-ID: <20060511145049.I72925@fledge.watson.org>
References: <20060506150622.C17611@fledge.watson.org>
	<20060509181302.GD3636@eucla.lemis.com>
	<20060509182330.GB92714@xor.obsecurity.org>
	<200605100726.28243.davidxu@freebsd.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: Greg 'groggy' Lehey <grog@freebsd.org>, freebsd-performance@freebsd.org,
	performance@freebsd.org, current@freebsd.org,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: Fine-grained locking for POSIX local sockets (UNIX
	domain	sockets)
X-BeenThere: freebsd-performance@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Performance/tuning <freebsd-performance.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-performance>,
	<mailto:freebsd-performance-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-performance>
List-Post: <mailto:freebsd-performance@freebsd.org>
List-Help: <mailto:freebsd-performance-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-performance>,
	<mailto:freebsd-performance-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 11 May 2006 13:54:13 -0000


On Wed, 10 May 2006, David Xu wrote:

> Fixing one of big lock contentions is not enough, you have to fix them all, 
> it is easy to see that a second contention becomes a top one. :-)

So I guess the real question is: do we want to merge the UNIX domain socket 
locking work?  The MySQL gains sound good, the performance drop under very 
high load seems problematic, and there are more general questions about 
performance with other workloads.

Maintaining this patch for a month or so is no problem, but as the tree 
changes it will get harder.

Robert N M Watson