On Wed, 20 Jun 2012 10:27:37 +0800 YANG Zhe <yangzhe1...@gmail.com> wrote:
> Hi Thomas, > > I read the htb code before so I'll show the problem here. > > When tc comes to calculate buffer & cbuffer, it set lookup get_hz() > and set buffer = rate / get_hz() + mtu. > > But nowadays, packet scheduling (sched) in kernel employ hrtimer so > that the old limit of activity only HZ (100) times per second is > removed. Also get_hz() returns 10^9 so that tc pretend that sched > start 10^9 times per second. So buffer would be set to no more than > mtu. > > But hrtimer doesn't work by this way. So every time htb starts, it can > only send about 2 packet and because of sched won't start too > frequently, the desired rate can't be reached. > > I would suggest that buffer should be manually set by user, and > converted to 10ms amount of data by default in future version of tc. > What about backward compatibility with older kernels. Maybe the kernel should just be fixed instead. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
