netdev - Re: [PATCH net] net_sched: gen_estimator: extend pps limit

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Date:	Wed, 08 Jul 2015 13:59:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ast@...mgrid.com, jhs@...atatu.com,
	john.fastabend@...il.com
Subject: Re: [PATCH net] net_sched: gen_estimator: extend pps limit

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 02 Jul 2015 15:57:19 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> rate estimators are limited to 4 Mpps, which was fine years ago, but
> too small with current hardware generation.
> 
> Lets use 2^5 scaling instead of 2^10 to get 128 Mpps new limit.
> 
> On 64bit arch, use an "unsigned long" for temp storage and remove limit.
> (We do not expect 32bit arches to be able to reach this point)
> 
> Tested:
> 
> tc -s -d filter sh dev eth0 parent ffff:
> 
> filter protocol ip pref 1 u32 
> filter protocol ip pref 1 u32 fh 800: ht divisor 1 
> filter protocol ip pref 1 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:15 
>   match 07000000/ff000000 at 12
> 	action order 1: gact action drop
> 	 random type none pass val 0
> 	 index 1 ref 1 bind 1 installed 166 sec
>  	Action statistics:
> 	Sent 39734251496 bytes 863788076 pkt (dropped 863788117, overlimits 0 requeues 0) 
> 	rate 4067Mbit 11053596pps backlog 0b 0p requeues 0 
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks.
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