Hi all, I am a system administrator trying to understand tc. I have been following the lartc documentation along with a few others. I am unable to understand few things explained in the howtos. Kindly help me with the same ... 1) Can somebody tell me the exact difference between a class and a qdisc? Martin Brown did try to explain to me but, I couldn't understand! 2) When we talk about pfifo, what is the 'pack size' understood to be; example, when I set limit to 10 (packets), how many bytes is my bucket? 3) 'HTB is suited for fixed bandwidth' ... by "fixed" what exactly is meant ... meaning can it be used where bandwidth is shared but at almost always a certain "fixed" bandwidth is available (even if available bandwidth exceeds, it will be by only a few bytes, for a short duration)? 4) Can somebody suggest which qdisc is most ideal (for shaping and scheduling) in a n/w where the ISP provies a (512Kbit) pipe, which is shared by multiple (4) clients but, an average of 45bytes can be expected at any point in time (although, it might exceed this)? 5) The lartc howto speaks about 'mpu' with reference to TBF, and states "for ethernet, no packet uses less than 64 bytes", can you please tell me whether 64 bytes is the least possible; meaning adding 20 bytes of IP and 28 bytes of TCP, I believed a TCP/IP packet with no payload could exist of 48 bytes, is this possible? and if a payload must be added, should it be 16 bytes atleast, can I not have a 52 byte ethernet packet? Kindly explain. Also, I am unable to see such a parameter when I do a tc...help, for TBF. 6) Could you please define the 'cell' parameter in a CBQ? Also, I am unable to see maxburst, minburst, minidle, mpu, rate parameter options when I do a ... for ex. : 'tc qdisc add dev eth0 handle 1 root cbq help' 7) How do I set WRR, link sharing and borrowing parameters using TC? 8) Also, please pardon my ignorance but, do I need a filter for a classless qdisc, cause if I were to attach a classless qdisc to the root qdisc then by default all packets enter this qdisc and I believe I wouldn't have the scope to classify ... right/wrong? Please help me. Thank you. Regards, suraj. __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com _______________________________________________ LARTC mailing list / LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
