On Wed, 2007-07-25 at 15:14 +0200, Edouard Thuleau wrote:
> I use the patch
> (http://ace-host.stuart.id.au/russell/files/tc/tc-atm/) for accurate
> the packet scheduling on ATM/ADSL link and i think I've found a bug.
> I tried to write to the author but he didn't answer me.
Sorry. :( I have now.
> I work on a Linux 2.6.17 with the iproute2-2.6.18-061002 package.
> I change the type of the cell_align char to short of the struct
> tc_ratespec in the file pkt_sched.h (in the include/linux/ directories
> of iproute package and the kernel source) :
>
> struct tc_ratespec
> {
> unsigned char cell_log;
> unsigned char __reserved;
> unsigned short feature; /* Always 0 in pre-atm patch kernels */
> - char cell_align; /* Always 0 in pre-atm patch kernels */
> - unsigned char __unused;
> + short cell_align; /* Always 0 in pre-atm patch kernels */
> unsigned short mpu;
> __u32 rate;
> };
>
> The results are much better and with my tests, it works very nicely.
>
> If it can help someone,
I can't see how that would change things as the cell align
always lies within the range -7..0. The only thing that
springs to mind is perhaps you aren't using i386, and your
CPU doesn't sign extend char's??? What CPU are you using?
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