From: Gleb Natapov <gleb@redhat.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH][rtc hack]: reduce number of reinjects on ACK
Date: Wed, 20 Jan 2010 15:37:33 +0200 [thread overview]
Message-ID: <20100120133733.GI5238@redhat.com> (raw)
Windows 7 BSODs under load with HAL_RTC_IRQF_WILL_NOT_CLEAR error.
It happens here:
hal!HalpRtcUnmaskClock:
8281b93a 8bff mov edi,edi
8281b93c 56 push esi
8281b93d 33f6 xor esi,esi
8281b93f 6a0c push 0Ch
8281b941 e8b2ffffff call hal!CMOS_READ (8281b8f8)
8281b946 84c0 test al,al
8281b948 7920 jns hal!HalpRtcUnmaskClock+0x30 (8281b96a)
8281b94a 6a0a push 0Ah
8281b94c 46 inc esi
8281b94d e854c8ffff call hal!KeStallExecutionProcessor (828181a6)
8281b952 83fe64 cmp esi,64h
8281b955 72e8 jb hal!HalpRtcUnmaskClock+0x5 (8281b93f)
8281b957 6a00 push 0
8281b959 6a00 push 0
8281b95b 6a00 push 0
8281b95d 680a010000 push 10Ah
8281b962 6a5c push 5Ch
8281b964 ff1500c38082 call dword ptr [hal!_imp__KeBugCheckEx (8280c300)]
8281b96a 5e pop esi
8281b96b c3 ret
So it loops for 100(64h) times reading register C before BSOD. Lets
reduce number of immediate reinjection well under this limit.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index e4d55c7..2616d0d 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -30,7 +30,7 @@
//#define DEBUG_CMOS
-#define RTC_REINJECT_ON_ACK_COUNT 1000
+#define RTC_REINJECT_ON_ACK_COUNT 20
#define RTC_SECONDS 0
#define RTC_SECONDS_ALARM 1
--
Gleb.
next reply other threads:[~2010-01-20 13:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 13:37 Gleb Natapov [this message]
2010-01-20 14:56 ` [Qemu-devel] [PATCH][rtc hack]: reduce number of reinjects on ACK Anthony Liguori
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