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add patch to allow packet schedulers to use the cpu TSC as time source (faster and more accurate)

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SVN-Revision: 2402
This commit is contained in:
Felix Fietkau 2005-11-10 00:02:57 +00:00
parent c8f1fc4777
commit 8aa95b234a
1 changed files with 72 additions and 0 deletions
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72
openwrt/target/linux/linux-2.4/patches/brcm/006-sched_use_tsc.patch Normal file
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@ -0,0 +1,72 @@
diff -urN linux.old/arch/mips/kernel/time.c linux.dev/arch/mips/kernel/time.c
--- linux.old/arch/mips/kernel/time.c 2005-01-19 15:09:29.000000000 +0100
+++ linux.dev/arch/mips/kernel/time.c 2005-11-09 23:10:04.233756250 +0100
@@ -151,6 +150,15 @@
unsigned int (*mips_hpt_read)(void);
void (*mips_hpt_init)(unsigned int);
+extern __u32 get_htscl(void)
+{
+ return timerhi;
+}
+
+extern __u64 get_tscll(void)
+{
+ return (((__u64) timerhi) << 32) | ((__u64) ((__u32) read_c0_count()));
+}
/*
* timeofday services, for syscalls.
@@ -761,3 +769,5 @@
EXPORT_SYMBOL(to_tm);
EXPORT_SYMBOL(rtc_set_time);
EXPORT_SYMBOL(rtc_get_time);
+EXPORT_SYMBOL(get_htscl);
+EXPORT_SYMBOL(get_tscll);
diff -urN linux.old/include/asm-mips/timex.h linux.dev/include/asm-mips/timex.h
--- linux.old/include/asm-mips/timex.h 2003-08-25 13:44:44.000000000 +0200
+++ linux.dev/include/asm-mips/timex.h 2005-11-09 22:15:59.352633250 +0100
@@ -31,6 +31,19 @@
return read_c0_count();
}
+extern __u32 get_htscl(void);
+extern __u64 get_tscll(void);
+
+#define rdtsc(low, high) \
+ high = get_htscl(); \
+ low = read_c0_count();
+
+#define rdtscl(low) \
+ low = read_c0_count();
+
+#define rdtscll(val) \
+ val = get_tscll();
+
#define vxtime_lock() do {} while (0)
#define vxtime_unlock() do {} while (0)
diff -urN linux.old/include/net/pkt_sched.h linux.dev/include/net/pkt_sched.h
--- linux.old/include/net/pkt_sched.h 2005-11-09 21:25:10.686721000 +0100
+++ linux.dev/include/net/pkt_sched.h 2005-11-09 21:54:26.063807750 +0100
@@ -5,7 +5,11 @@
#define PSCHED_JIFFIES 2
#define PSCHED_CPU 3
+#ifdef __mips__
+#define PSCHED_CLOCK_SOURCE PSCHED_CPU
+#else
#define PSCHED_CLOCK_SOURCE PSCHED_JIFFIES
+#endif
#include <linux/config.h>
#include <linux/types.h>
@@ -271,7 +275,7 @@
#define PSCHED_US2JIFFIE(delay) (((delay)+psched_clock_per_hz-1)/psched_clock_per_hz)
#define PSCHED_JIFFIE2US(delay) ((delay)*psched_clock_per_hz)
-#ifdef CONFIG_X86_TSC
+#if defined(CONFIG_X86_TSC) || defined(__mips__)
#define PSCHED_GET_TIME(stamp) \
({ u64 __cur; \