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From: Patrick McHardy <kaber@trash.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] New IMQ device implementation supporting device EOS
Date: Wed, 31 Mar 2004 00:46:07 +0000	[thread overview]
Message-ID: <406A14CF.2040409@trash.net> (raw)
In-Reply-To: <40683536.4010104@hlohovec.net>

Andy Furniss wrote:
> Jiri Fojtasek wrote:
>>
>>
>> It leave always only one packet in the device queue. It is there until 
>> is not dequeued (sent to the device driver) and then is inserted 
>> another etc, etc
> 
> 
> I think I understand - in the case of imq -> ppp -> usb/pci -> radsl 
> modem with big buffer -> phone line. imq will only let one packet wait 
> in ppp queue, but there could still be a full buffer in the "real" device.

I haven't followed the discussion, but this is the way it is supposed to 
work. As IMQ can queue packets for multiple devices it is not possible
to couple the dequeue event with the "real" output device's dequeue
event, simply because there may be multiple. Use non-work-conserving
qdiscs in this case and make sure you don't exceed the rate of the
individual output devices.

Regards
Patrick
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  parent reply	other threads:[~2004-03-31  0:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-29 14:39 [LARTC] New IMQ device implementation supporting device EOS Jiri Fojtasek
2004-03-29 18:31 ` Jiri Fojtasek
2004-03-29 19:21 ` Jiri Fojtasek
2004-03-29 20:40 ` Jiri Fojtasek
2004-03-30 10:45 ` Andy Furniss
2004-03-30 10:52 ` Andy Furniss
2004-03-30 21:51 ` Jiri Fojtasek
2004-03-30 23:51 ` Andy Furniss
2004-03-31  0:46 ` Patrick McHardy [this message]
2004-03-31  1:54 ` Roy
2004-03-31  8:13 ` Jiri Fojtasek
2004-03-31  8:27 ` Jiri Fojtasek

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