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Red Hat Bugzilla – Attachment 295028 Details for
Bug 430938
RHEL5.2: Improved Power Now! in Xen support on 2nd generation Opteron systems
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[patch]
resync TSC extrapolation
RHEL5.2_resync_TSC_extrapolated_freq.patch (text/plain), 742 bytes, created by
Bhavna Sarathy
on 2008-02-15 18:40:51 UTC
(
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Description:
resync TSC extrapolation
Filename:
MIME Type:
Creator:
Bhavna Sarathy
Created:
2008-02-15 18:40:51 UTC
Size:
742 bytes
patch
obsolete
>Resolves BZ 430938 > >When Xen is notified that CPU frequency has changed, do not trust >the current TSC-extrapolated time when we re-sync. > > >--- xen/arch/x86/time.c.resyncorig 2008-02-06 16:24:30.000000000 -0500 >+++ xen/arch/x86/time.c 2008-02-06 16:28:44.000000000 -0500 >@@ -733,8 +733,10 @@ int cpu_frequency_change(u64 freq) > local_irq_disable(); > rdtscll(curr_tsc); > t->local_tsc_stamp = curr_tsc; >- t->stime_local_stamp = get_s_time(); > t->stime_master_stamp = read_platform_stime(); >+ /* TSC-extrapolated time may be bogus after frequency change. */ >+ /*t->stime_local_stamp = get_s_time();*/ >+ t->stime_local_stamp = t->stime_master_stamp; > set_time_scale(&t->tsc_scale, freq); > local_irq_enable(); >
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