Hi Stephen, Many thanks for that information. I thought my iproute2 was up to date, but I must have made a mistake somewhere. I'll go and grab it again. I can see your point about prio or (p/b)fifo not being much slower, but this will be running on an oldish Celeron box so I wanted to make things as memory efficient as possible. Again, many thanks for clearing that up. Mark Lidstone IT and Network Support Administrator BMT SeaTech Ltd Grove House, Meridians Cross, 7 Ocean Way Ocean Village, Southampton. SO14 3TJ. UK Tel: +44 (0)23 8063 5122 Fax: +44 (0)23 8063 5144 E-Mail: mailto:mark.lidstone@xxxxxxxxxxxxxxxx Website: www.bmtseatech.co.uk ======================================================================== == Confidentiality Notice and Disclaimer: The contents of this e-mail and any attachments are intended only for the use of the e-mail addressee(s) shown. If you are not that person, or one of those persons, you are not allowed to take any action based upon it or to copy it, forward, distribute or disclose the contents of it and you should please delete it from your system. BMT SeaTech Limited does not accept liability for any errors or omissions in the context of this e-mail or its attachments which arise as a result of Internet transmission, nor accept liability for statements which are those of the author and not clearly made on behalf of BMT SeaTech Limited. ======================================================================== == -----Original Message----- From: Stephen Hemminger [mailto:shemminger@xxxxxxxx] Sent: 15 November 2005 19:00 To: Mark Lidstone Cc: lartc@xxxxxxxxxxxxxxx Subject: Re: Pfifo_fast "Unknown qdisc" and asking for basic design advice On Fri, 11 Nov 2005 09:50:03 -0000 "Mark Lidstone" <mark.lidstone@xxxxxxxxxxxxxxxx> wrote: > Hi all, > > I've done a search through the archives but I can't find a > cause/solution to this. > > I'm running a FC4 box with the stock 2.6.12 kernel and a FC2 box with > a stock 2.6.9 kernel. I'm obviously using > iproute2 and the patched tc. > > When I clear down the qdiscs with "tc qdisc del dev <DEV> root" I get > the following in response to "tc qdisc": > > qdisc pfifo_fast 0: dev eth0 [Unknown qdisc, optlen=20] > qdisc pfifo_fast 0: dev eth1 [Unknown qdisc, optlen=20] > Current versions of iproute2 know about pfifo_fast. > Unfortunately I cannot add pfifo_fast as a queue type (I was hoping to > use one - see below). Have I missed something? pfifo_fast is only suitable as a baseline with no other qdisc's involved. It can only sit directly on the device (at the bottom). It shouldn't be that much faster than doing it with prio and fifo for most things. The additional overhead of prio and fifo are mostly because they are in separate modules and that adds some memory locality penalty. _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
