Michał Margula wrote:
Hello!
I am using since yesterday ESFQ instead of N HTB queues. It mostly
works OK, but when somebody is using one single sesion (for example
downloading file via FTP), it gets weird speed. For example it is 20
kilobytes pres second, then drops down to 9, then 20 again, and then
slowly to 0 and stops. But when using download accelererator of some
kind or bittorrent client which uses many connections, speed seems to be
stable.
I am using esfq that way:
qdisc add dev eth0 parent 1:4 handle 4:0 esfq perturb 600 hash
fwmark divisor 13
qdisc add dev eth1 parent 1:2 handle 2:0 esfq perturb 600 hash dst
divisor 13
On eth0 every IP is marked with different value by IPMARK module. On
eth1 it is not necessary so I use dst hash. I have more values than 2^13
so I can't use direct hash.
Any ideas? Is it possible to use bigger divisor or algorithm is not
designed to deal with bigger hash? Any ideas will be appreciated!
Corey Hickey changed his esfq to use jhash for dst/src/fw - copy of his
announce below.
Andy.
Corey Hickey wrote:
> In a recent thread on this list, Robert Kurjata provided me a patch
to add
> hashing by iptables mark to the Linux 2.4 version of ESFQ. Thanks to that
> contribution, I was able to easily add support to the 2.6 port I
maintain.
>
> I found out, however, that the existing hash algorithm results in a
lot of
> colllisions when the range of hashed values is small. The purturbation
> spreads the collisions out a little, but the result still wasn't very
> fair, especially when hashing only three fwmark values: 0, 1 and 2.
>
> So, I wrote an alternative hash function. It's quite simple, and as long
> as the range of input values is smaller than the hash table (default
1024,
> up to 16384), collisions will not happen at all. See the updated README
> file for more details.
>
> Home page:
> http://fatooh.org/esfq-2.6/
>
> Direct URL:
> http://fatooh.org/esfq-2.6/esfq-2.6.13.tar.gz
>
> README (also available in the tar.gz):
> http://fatooh.org/esfq-2.6/current/README
>
> Try it out, have fun, and if you find a bug or have a suggestion please
> send me an email.
>
> -Corey
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