Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

[Rick Jones]

> That came from named. It opens lots of sockets with SIOCGSTAMP.
> No idea what it needs that many for.

IIRC ISC BIND named opens a socket for each IP it finds on the system. 
Presumeably in this way it "knows" implicitly the destination IP without 
using platform-specific recvfrom/whatever extensions and gets some 
additional parallelism in the stack on SMP systems.

Why it needs/wants the timestamps I've no idea, I don't think it gets 
them that way on all platforms.  I suppose the next time I do some named 
benchmarking I can try to take a closer look in the source.

rick jones
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/