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Date: Mon, 09 Jul 2007 01:42:48 +0200 From: Gabriel C <nix.or.die@...glemail.com> To: Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> CC: Ingo Molnar <mingo@...e.hu>, Rui Nuno Capela <rncbc@...bc.org>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, RT-Users <linux-rt-users@...r.kernel.org>, Steven Rostedt <rostedt@...dmis.org>, "jcaceres@...ma.Stanford.EDU" <jcaceres@...ma.Stanford.EDU>, Carsten Emde <carsten.emde@...dl.org> Subject: Re: v2.6.21.5-rt19 Fernando Lopez-Lezcano wrote: > On Sat, 2007-07-07 at 11:24 +0200, Ingo Molnar wrote: > >> * Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> wrote: >> >>>>> Changes since 2.6.21.5-rt18: >>>>> >>>>> - Fixed a nasty and hard to track down slowness / boot problem on SMP >>>>> machines with CONFIG_NOHZ enabled. The problem was caused by the timer >>>>> wheel base lock held during the get_next_timer_interrupt() call in the >>>>> idle path, which eventually led to a bogus PI boosting of the idle task >>>>> and in consequence a stale wrong scheduler selection for the affected idle >>>>> task. >>>>> >>>>> Kudos to Carsten Emde, who patiently and meticulously isolated the >>>>> problem and provided the traces, which allowed to identify the root cause. >>>>> >>>>> Problem solution: Prevent idle task boosting >>>>> >>>> Maybe someone remember me whining about troubles with 2.6.21-rt2..18 >>>> on my Core2 T7200 laptop (fujitsu-siemens amilo i1520). >>>> >>>> Althought I'm still with my fingers crossed, I can tell the good >>>> news are that 2.6.21.5-rt19 (and -rt20) does behave far better now >>>> on the very same box. >>>> >>> Yes, it works much better indeed... >>> >>> Ingo: is there a place where I can read about the changes in different >>> rtxx releases? What is new/better/fixed in rt20? (I see scheduler >>> stuff in a diff from rt19 to rt20 but I don't really know what it >>> means). >>> >> and rt18 was a -rt-only NOHZ fix, that bug got introduced in rt11 when >> CFS was merged. >> >> i _think_ Rui might have seen two separate problems. Perhaps by the time >> we fixed the first problem (which Rui saw since -rt2) we introduced the >> other one via -rt11 - which then got fixed in -rt19. >> > > Ahh, CFS is now part of rt, I was obviously not paying attention... I'm > really trying to provide a "stable" rt kernel for audio usage and > including another subsystem into rt is - IMHO - not going to help. > What's the chance of splitting things? > > >> btw., we'd love to get more feedback regarding CFS. CFS is a completely >> new scheduler for Linux. >> > > Then I'd rather have it separate from rt. > > >> It has a design centered around keeping >> application latencies down, so it is ultimately real-time friendly, and >> it should also make things work better for desktop-ish and audio-ish >> stuff as well. (even under SCHED_OTHER) >> > > Maybe this is CFS related? (tail of a thread in the Planet CCRMA mailing > list): > > On Sun, 2007-07-08 at 15:26 -0400, Hector Centeno wrote: > >> Ok, so just to confirm, that 2.6.21-0182.rt19.1.fc7.ccrmart works fine >> on my desktop but on my laptop it makes Firefox and Tomboy to crash. >> On the same laptop using 2.6.21-0182.rt17.1.fc7.ccrmart there is no >> problem. >> >> Cheers, >> >> Hector >> >> >> On 7/7/07, Hector Centeno <hcengar@...il.com> wrote: >> Hi Fernando, >> >> I do have Flash installed but for me Firefox crashes when >> trying to >> access gmail (which AFAIK doesn't use Flash, does it?). Right >> now >> Firefox is frozen and I'm typing this email using Konkeror (in >> Gnome). >> This is ps' output: >> >> hector 3595 1.1 2.2 194352 46336 ? D 16:25 >> 0:03 >> /usr/lib/firefox-2.0.0.4/firefox-bin >> >> I think the problem is not present in my Desktop but I have to >> double >> check. In the same laptop using the stock fedora kernel both >> Tomboy >> and Firefox work fine. My laptop has a centrino duo processor, >> 2 gigs >> of ram and the Inte GMA950 graphics chip. >> >> Hector >> > > I managed to completely hang firefox (fc7) with flash 9 installed > (unkillable even with -9). Firefox with flash 9 does not work good , there are a lot bugs reported about ( just google ) and it hangs on vanilla or whatever other kernels as well. Not only Firefox but also Swiftfox, Opera, Epiphany etc. The most time Firefox dies when you use flash 9 and close a window or a tab. > Does not seem to happen with flash 7. Yes flash 7 is fine. > Have > not tried yet with gmail and flash uninstalled. I'll try to strace it to > see when/why it hangs. > > > -- Fernando > > > >> So it would be nice if you could keep an extra eye on any scheduling >> artifacts or regressions, and make sure your favorite workload is still >> handled by the Linux scheduler in the utmost best way. I'd like to hear >> about any sort of "scheduling behavior / interactivity" regression you >> might see, relative to the vanilla kernel. Or if you can see no such >> problems then a line of "it works as well as the previous scheduler" is >> important info to us too. Thanks! >> > > > Regards, Gabriel C - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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