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pkt_sched: add DRR scheduler

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Add classful DRR scheduler as a more flexible replacement for SFQ.

The main difference to the algorithm described in "Efficient Fair Queueing
using Deficit Round Robin" is that this implementation doesn't drop packets
from the longest queue on overrun because its classful and limits are
handled by each individual child qdisc.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-11-20 04:10:00 -08:00 • committed by David S. Miller
commit 13d2a1d2b0
4 changed files with 533 additions and 0 deletions
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16
include/linux/pkt_sched.h
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@ -500,4 +500,20 @@ struct tc_netem_corrupt
#define NETEM_DIST_SCALE 8192
/* DRR */
enum
{
TCA_DRR_UNSPEC,
TCA_DRR_QUANTUM,
__TCA_DRR_MAX
};
#define TCA_DRR_MAX (__TCA_DRR_MAX - 1)
struct tc_drr_stats
{
u32 deficit;
};
#endif