From: bert hubert <ahu@ds9a.nl>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] RED problem !
Date: Tue, 01 Jan 2002 18:58:29 +0000 [thread overview]
Message-ID: <marc-lartc-100991155103337@msgid-missing> (raw)
In-Reply-To: <marc-lartc-100990423626623@msgid-missing>
On Tue, Jan 01, 2002 at 10:33:06PM +0530, Arindam Haldar wrote:
> hi all,
>
> while trying red inplace of sfq/pfifo i go the follwing error
>
> tc qdisc add dev eth0 parent 1:470 red max 12288 min 6100 limit 12288
> avpkt 1514 burst 2
This returns -1:
int tc_red_eval_ewma(unsigned qmin, unsigned burst, unsigned avpkt)
{
int wlog = 1;
double W = 0.5;
double a = (double)burst + 1 - (double)qmin/avpkt;
if (a < 1.0)
return -1;
for (wlog=1; wlog<32; wlog++, W /= 2) {
if (a <= (1 - pow(1-W, burst))/W)
return wlog;
}
return -1;
}
You can use this to calculate what is wrong. Either burst+1-qmin/avpkt is
smaller than 1, or a is too high to be matched by a time constant.
Regards,
bert
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next prev parent reply other threads:[~2002-01-01 18:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-01 16:57 [LARTC] RED problem ! Arindam Haldar
2002-01-01 18:58 ` bert hubert [this message]
2002-01-02 11:37 ` Sumit Pandya
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