Date: Tue, 26 Sep 2006 12:05:57 +0300 From: Viktor Rosendahl <viktor.rosendahl@saunalahti.fi> To: stable@freebsd.org Subject: /usr/src/sys/i386/i386/local_apic.c and status of ULE Message-ID: <200609261205.57901.viktor.rosendahl@saunalahti.fi>
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--Boundary-00=_11OGF3JsTDmUTwn Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi all, I wonder, what is the status of the ULE scheduler? Is it supposed to work at all? I upgraded my -stable system some time ago and it started to hang at the end of the boot process, right before the mounting of the root device. I found out that the immediate cause was a change in /usr/src/sys/i386/i386/local_apic.c. I attach a patch that reverts the change, so that you can see what I am talking about. However, it only hangs if I use the ULE scheduler. That's why I wonder whether the ULE scheduler is supposed to work or not. Now, I understand that it might very well depend on some additional local condition. Thus, I also attach my dmesg (of a successful boot) and my kernel configuration file. best regards, Viktor --Boundary-00=_11OGF3JsTDmUTwn Content-Type: text/x-diff; charset="us-ascii"; name="apic.diff" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="apic.diff" diff -Naur src/sys/i386/i386/local_apic.c src.fixed/sys/i386/i386/local_apic.c --- src/sys/i386/i386/local_apic.c Sun Sep 24 02:56:22 2006 +++ src.fixed/sys/i386/i386/local_apic.c Sun Mar 19 13:53:42 2006 @@ -610,18 +610,6 @@ lapic_handle_timer(struct clockframe frame) { struct lapic *la; - -#ifdef SMP - /* - * Don't do any accounting for the disabled HTT cores, since it - * will provide misleading numbers for the userland. - * - * No locking is necessary here, since even if we loose the race - * when hlt_cpus_mask changes it is not a big deal, really. - */ - if ((hlt_cpus_mask & (1 << PCPU_GET(cpuid))) != 0) - return; -#endif la = &lapics[PCPU_GET(apic_id)]; (*la->la_timer_count)++; --Boundary-00=_11OGF3JsTDmUTwn--
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