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Date: Thu, 05 Jan 2012 14:08:43 -0500 (EST) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: netdev@...r.kernel.org, dave.taht@...il.com Subject: Re: [PATCH net-next] net_sched: sfq: extend limits From: Eric Dumazet <eric.dumazet@...il.com> Date: Thu, 05 Jan 2012 01:18:38 +0100 > SFQ as implemented in Linux is very limited, with at most 127 flows > and limit of 127 packets. [ So if 127 flows are active, we have one > packet per flow ] > > This patch brings to SFQ following features to cope with modern needs. > > - Ability to specify a smaller per flow limit of inflight packets. > (default value being at 127 packets) > > - Ability to have up to 65408 active flows (instead of 127) > > - Ability to have head drops instead of tail drops > (to drop old packets from a flow) > > Example of use : No more than 20 packets per flow, max 8000 flows, max > 20000 packets in SFQ qdisc, hash table of 65536 slots. > > tc qdisc add ... sfq \ > flows 8000 \ > depth 20 \ > headdrop \ > limit 20000 \ > divisor 65536 > > Ram usage : > > 2 bytes per hash table entry (instead of previous 1 byte/entry) > 32 bytes per flow on 64bit arches, instead of 384 for QFQ, so much > better cache hit ratio. > > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com> Applied. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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