From owner-freebsd-hackers@FreeBSD.ORG Sat Apr 26 11:49:45 2014 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DAEBAD27 for ; Sat, 26 Apr 2014 11:49:45 +0000 (UTC) Received: from mail.tdx.com (mail.tdx.com [62.13.128.18]) by mx1.freebsd.org (Postfix) with ESMTP id 6851512D4 for ; Sat, 26 Apr 2014 11:49:45 +0000 (UTC) Received: from study64.tdx.co.uk (study64.tdx.co.uk [62.13.130.231]) (authenticated bits=0) by mail.tdx.com (8.14.3/8.14.3/) with ESMTP id s3QBnfsD041094 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 26 Apr 2014 12:49:42 +0100 (BST) Date: Sat, 26 Apr 2014 12:49:41 +0100 From: Karl Pielorz To: Jilles Tjoelker Subject: Re: HAST performance / dtrace / _umtx_op Message-ID: <055E8D8DCB6AC34FD6E7AB24@study64.tdx.co.uk> In-Reply-To: <20140426112943.GA81447@stack.nl> References: <20140426112943.GA81447@stack.nl> X-Mailer: Mulberry/4.0.8 (Mac OS X) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Cc: freebsd-hackers@freebsd.org X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Apr 2014 11:49:45 -0000 --On 26 April 2014 13:29:43 +0200 Jilles Tjoelker wrote: > _umtx_op implements blocking not only for mutexes but also for condition > variables, and in the latter case waiting for a long time does not > indicate a problem. Thanks for the info - I'll keep looking around, though it's looking like the cause is not going to be anything obvious/simple (to me, anyway :-) -Karl