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Message-Id: <1189592097.26927.27.camel@localhost.localdomain> Date: Wed, 12 Sep 2007 12:14:57 +0200 From: Jesper Dangaard Brouer <jdb@...x.dk> To: "netdev@...r.kernel.org" <netdev@...r.kernel.org> Cc: Patrick McHardy <kaber@...sh.net>, "David S. Miller" <davem@...emloft.net>, Stephen Hemminger <shemminger@...ux-foundation.org> Subject: [PATCH 6/6] [IPROUTE2]: Change the rate table calc of transmit cost to use upper bound value commit 2e3edbef7913ac43899c8258ee59d9032778cee1 Author: Jesper Dangaard Brouer <hawk@...x.dk> Date: Wed Sep 5 15:24:51 2007 +0200 [IPROUTE2]: Change the rate table calc of transmit cost to use upper bound value. Patrick McHardy, Cite: 'its better to overestimate than underestimate to stay in control of the queue'. Illustrating the rate table array: Legend description rtab[x] : Array index x of rtab[x] xmit_sz : Transmit size contained in rtab[x] (normally transmit time) maps[a-b] : Packet sizes from a to b, will map into rtab[x] Current/old rate table mapping (cell_log:3): rtab[0]:=xmit_sz:0 maps[0-7] rtab[1]:=xmit_sz:8 maps[8-15] rtab[2]:=xmit_sz:16 maps[16-23] rtab[3]:=xmit_sz:24 maps[24-31] rtab[4]:=xmit_sz:32 maps[32-39] rtab[5]:=xmit_sz:40 maps[40-47] rtab[6]:=xmit_sz:48 maps[48-55] New rate table mapping, with kernel cell_align support. rtab[0]:=xmit_sz:8 maps[0-8] rtab[1]:=xmit_sz:16 maps[9-16] rtab[2]:=xmit_sz:24 maps[17-24] rtab[3]:=xmit_sz:32 maps[25-32] rtab[4]:=xmit_sz:40 maps[33-40] rtab[5]:=xmit_sz:48 maps[41-48] rtab[6]:=xmit_sz:56 maps[49-56] New TC util on a kernel WITHOUT support for cell_align rtab[0]:=xmit_sz:8 maps[0-7] rtab[1]:=xmit_sz:16 maps[8-15] rtab[2]:=xmit_sz:24 maps[16-23] rtab[3]:=xmit_sz:32 maps[24-31] rtab[4]:=xmit_sz:40 maps[32-39] rtab[5]:=xmit_sz:48 maps[40-47] rtab[6]:=xmit_sz:56 maps[48-55] Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk> diff --git a/tc/tc_core.c b/tc/tc_core.c index c713a18..752b07c 100644 --- a/tc/tc_core.c +++ b/tc/tc_core.c @@ -84,11 +84,12 @@ int tc_calc_rtable(struct tc_ratespec *r, __u32 *rtab, int cell_log, unsigned mt cell_log++; } for (i=0; i<256; i++) { - unsigned sz = (i<<cell_log); + unsigned sz = ((i+1)<<cell_log); if (sz < mpu) sz = mpu; rtab[i] = tc_calc_xmittime(bps, sz); } + r->cell_align=-1; // Due to the sz calc r->cell_log=cell_log; return cell_log; } - 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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