From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Zup05-0004BY-PP for user-mode-linux-devel@lists.sourceforge.net; Fri, 06 Nov 2015 21:56:49 +0000 Received: from a.ns.miles-group.at ([95.130.255.143] helo=radon.swed.at) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1Zup04-0003IW-Dg for user-mode-linux-devel@lists.sourceforge.net; Fri, 06 Nov 2015 21:56:49 +0000 References: <1446480997-155855-1-git-send-email-aivanov@brocade.com> From: Richard Weinberger Message-ID: <563D2217.1070002@nod.at> Date: Fri, 6 Nov 2015 22:56:39 +0100 MIME-Version: 1.0 In-Reply-To: <1446480997-155855-1-git-send-email-aivanov@brocade.com> List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net Subject: Re: [uml-devel] [PATCH v4] um: Switch clocksource to hrtimers To: Anton Ivanov , user-mode-linux-devel@lists.sourceforge.net Cc: Thomas Meyer Am 02.11.2015 um 17:16 schrieb Anton Ivanov: > Background: UML is using an obsolete itimer call for > all timers and "polls" for kernel space timer firing > in its userspace portion resulting in a long list > of bugs and incorrect behaviour(s). It also uses > ITIMER_VIRTUAL for its timer which results in the > timer being dependent on it running and the cpu > load. > > This patch fixes this by moving to posix high resolution > timers firing off CLOCK_MONOTONIC and relaying the timer > correctly to the UML userspace. > > FIXES: crashes when hosts suspends/resumes > > FIXES: broken userspace timers - effecive ~40Hz instead > of what they should be. Note - this modifies skas behavior > by no longer setting an itimer per clone(). Timer events > are relayed instead. > > FIXES: kernel network packet scheduling disciplines > FIXES: tcp behaviour especially under load > FIXES: various timer related corner cases > > IMPROVES: overall responsiveness of the userspace > > Signed-off-by: Thomas Meyer > Signed-off-by: Anton Ivanov Applied! Thanks, //richard ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel