From owner-freebsd-current@freebsd.org Fri Jan 13 19:18:00 2017 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9B7C4CACAE9 for ; Fri, 13 Jan 2017 19:18:00 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from mail.baldwin.cx (bigwig.baldwin.cx [IPv6:2001:470:1f11:75::1]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7AF4A156A for ; Fri, 13 Jan 2017 19:18:00 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from ralph.baldwin.cx (c-73-231-226-104.hsd1.ca.comcast.net [73.231.226.104]) by mail.baldwin.cx (Postfix) with ESMTPSA id 347FF10B54B; Fri, 13 Jan 2017 14:17:59 -0500 (EST) From: John Baldwin To: Jakob Alvermark Cc: freebsd-current@freebsd.org, Shawn Webb Subject: Re: r311568 makes freerdp very slow Date: Fri, 13 Jan 2017 10:44:27 -0800 Message-ID: <4229440.M2aXL9uEHZ@ralph.baldwin.cx> User-Agent: KMail/4.14.10 (FreeBSD/11.0-STABLE; KDE/4.14.10; amd64; ; ) In-Reply-To: <54232.193.12.143.142.1484297881.squirrel@webmail.alvermark.net> References: <57236.193.12.143.142.1484240708.squirrel@webmail.alvermark.net> <1610370.k87iRho0oa@ralph.baldwin.cx> <54232.193.12.143.142.1484297881.squirrel@webmail.alvermark.net> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.4.3 (mail.baldwin.cx); Fri, 13 Jan 2017 14:17:59 -0500 (EST) X-Virus-Scanned: clamav-milter 0.99.2 at mail.baldwin.cx X-Virus-Status: Clean X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jan 2017 19:18:00 -0000 On Friday, January 13, 2017 09:58:01 AM Jakob Alvermark wrote: > On Thu, January 12, 2017 19:26, John Baldwin wrote: > > On Thursday, January 12, 2017 12:42:11 PM Shawn Webb wrote: > > > >> On Thu, Jan 12, 2017 at 06:05:08PM +0100, Jakob Alvermark wrote: > >> > >>> Hi, > >>> > >>> > >>> r311568 Set MORETOCOME for AIO write requests on a socket. > >>> > >>> After this commit freerdp is very slow. > >>> > >>> > >>> Before the password prompt would appear immediately when connecting > >>> to a server. Now it takes 5-10 seconds. After entering the password, > >>> another 5-10 seconds until I am connected. > >>> Once connected, there is a considerable lag. > >>> > >>> > >>> What could be the problem? > >>> > >> > >> I don't know what the problem is, but I am seeing the same symptom. > >> > > > > Can you get a ktrace of the freerdp process during this? The commit > > should only be setting MORETOCOME if multiple aio_write requests are queued > > to the same socket (so that TCP can batch them into a single packet). > > However, it should not affect an application just calling > > aio_write() on a socket once. > > > > -- > > John Baldwin > > Hi John, > > I got the ktrace, what do I do with it? kdump will generate a text representation, perhaps using 'kdump -s' to not include dumps of raw I/O data. If you can put the output of kdump at a URL I can fetch from then I can look at it. -- John Baldwin