diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-06-23 11:11:42 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-23 11:11:42 +0200 |
| commit | f34bfb1beef8a17ba3d46b60f8fa19ffedc1ed8d (patch) | |
| tree | 0816c565d26ae24854616faa0d497be365c2fe8b /net/sched/sch_htb.c | |
| parent | ee4311adf105f4d740f52e3948acc1d81598afcc (diff) | |
| parent | 481c5346d0981940ee63037eb53e4e37b0735c10 (diff) | |
Merge branch 'linus' into tracing/ftracetip-tracing-ftrace-2008-06-23_09.11_Mon
Diffstat (limited to 'net/sched/sch_htb.c')
| -rw-r--r-- | net/sched/sch_htb.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 5bc1ed490180..6807c97985a5 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -28,6 +28,7 @@ * $Id: sch_htb.c,v 1.25 2003/12/07 11:08:25 devik Exp devik $ */ #include <linux/module.h> +#include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/string.h> @@ -53,13 +54,17 @@ */ #define HTB_HSIZE 16 /* classid hash size */ -#define HTB_HYSTERESIS 1 /* whether to use mode hysteresis for speedup */ +static int htb_hysteresis __read_mostly = 0; /* whether to use mode hysteresis for speedup */ #define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */ #if HTB_VER >> 16 != TC_HTB_PROTOVER #error "Mismatched sch_htb.c and pkt_sch.h" #endif +/* Module parameter and sysfs export */ +module_param (htb_hysteresis, int, 0640); +MODULE_PARM_DESC(htb_hysteresis, "Hysteresis mode, less CPU load, less accurate"); + /* used internaly to keep status of single class */ enum htb_cmode { HTB_CANT_SEND, /* class can't send and can't borrow */ @@ -462,19 +467,21 @@ static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) htb_remove_class_from_row(q, cl, mask); } -#if HTB_HYSTERESIS static inline long htb_lowater(const struct htb_class *cl) { - return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0; + if (htb_hysteresis) + return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0; + else + return 0; } static inline long htb_hiwater(const struct htb_class *cl) { - return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0; + if (htb_hysteresis) + return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0; + else + return 0; } -#else -#define htb_lowater(cl) (0) -#define htb_hiwater(cl) (0) -#endif + /** * htb_class_mode - computes and returns current class mode |