Message ID | 1386227457-86900-3-git-send-email-yangyingliang@huawei.com |
---|---|
State | Changes Requested, archived |
Delegated to: | David Miller |
Headers | show |
On Thu, 2013-12-05 at 15:10 +0800, Yang Yingliang wrote: > Now, 32bit rates may be not the true rate. > So use rate_bytes_ps which is from > max(rate32, rate64) to calcualte quantum. > > Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> > Acked-by: Eric Dumazet <edumazet@google.com> > --- > net/sched/sch_htb.c | 18 ++++++++++-------- > 1 file changed, 10 insertions(+), 8 deletions(-) > > diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c > index 0e1e38b..57c6678 100644 > --- a/net/sched/sch_htb.c > +++ b/net/sched/sch_htb.c > @@ -1477,11 +1477,20 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, > sch_tree_lock(sch); > } > > + rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; > + > + ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; > + > + psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); > + psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); > + > /* it used to be a nasty bug here, we have to check that node > * is really leaf before changing cl->un.leaf ! > */ > if (!cl->level) { > - cl->quantum = hopt->rate.rate / q->rate2quantum; > + u64 quantum = div64_u64(cl->rate.rate_bytes_ps, > + q->rate2quantum); q->rate2quantum being 32bit, prefer the following : u64 quantum = cl->rate.rate_bytes_ps; do_div(quantum, q->rate2quantum); Since it maps to better assembly code on 32bit arches. > + cl->quantum = min_t(u64, quantum, INT_MAX); > if (!hopt->quantum && cl->quantum < 1000) { > pr_warning( > "HTB: quantum of class %X is small. Consider r2q change.\n", > @@ -1500,13 +1509,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, > cl->prio = TC_HTB_NUMPRIO - 1; > } > > - rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; > - > - ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; > - > - psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); > - psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); > - > cl->buffer = PSCHED_TICKS2NS(hopt->buffer); > cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer); > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2013/12/5 20:18, Eric Dumazet wrote: > On Thu, 2013-12-05 at 15:10 +0800, Yang Yingliang wrote: >> if (!cl->level) { >> - cl->quantum = hopt->rate.rate / q->rate2quantum; >> + u64 quantum = div64_u64(cl->rate.rate_bytes_ps, >> + q->rate2quantum); > > q->rate2quantum being 32bit, prefer the following : > > u64 quantum = cl->rate.rate_bytes_ps; > > do_div(quantum, q->rate2quantum); > > Since it maps to better assembly code on 32bit arches. Change it in v6, thanks! Regards, Yang -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 0e1e38b..57c6678 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1477,11 +1477,20 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, sch_tree_lock(sch); } + rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; + + ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; + + psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); + psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); + /* it used to be a nasty bug here, we have to check that node * is really leaf before changing cl->un.leaf ! */ if (!cl->level) { - cl->quantum = hopt->rate.rate / q->rate2quantum; + u64 quantum = div64_u64(cl->rate.rate_bytes_ps, + q->rate2quantum); + cl->quantum = min_t(u64, quantum, INT_MAX); if (!hopt->quantum && cl->quantum < 1000) { pr_warning( "HTB: quantum of class %X is small. Consider r2q change.\n", @@ -1500,13 +1509,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, cl->prio = TC_HTB_NUMPRIO - 1; } - rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; - - ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; - - psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); - psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); - cl->buffer = PSCHED_TICKS2NS(hopt->buffer); cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer);