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[Xen-devel] [PATCH]Improve HPET comparator reprog to prevent intr-near-m
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| Subject: | [Xen-devel] [PATCH]Improve HPET comparator reprog to prevent intr-near-missing case |
| From: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
| Date: | Tue, 3 Jun 2008 15:28:27 +0800 |
| Cc: | "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Tue, 03 Jun 2008 00:29:12 -0700 |
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| Thread-index: | AcjFS2pZnBv+xATeS8SqNl39gpRHcA== |
| Thread-topic: | [PATCH]Improve HPET comparator reprog to prevent intr-near-missing case |
HPET intr-near-missing means if the current counter value is too close to the comparator value to be reprogrammed the expected HPET intr may be missing. Linux kernel uses a mininal 48-hpet-ticks(~3.5us) distance to workaround this, but personal observation showed there is still failure case while delta=0xba (~13.5us). So choosing 20us as the MIN_DELTA_NS should be helpful to prevent near-missing from happening. local_irq_save/restore were used to avoid disturbance. (+ 2) was used as a final guard to avoid wrong judgement due to the real happened near-missing case. Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx> Signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx> Jimmy
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