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author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:30:19 +0200 |
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committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:45:34 +0200 |
commit | 535c55df136ad2783d444e54d518a8fae8bdbf79 (patch) | |
tree | 8f7b18bc7b82270e78061c4c22bf722534b743a1 /fs/attr.c | |
parent | 3306c781ff13aea89606435c134ec84e3c608681 (diff) | |
download | op-kernel-dev-535c55df136ad2783d444e54d518a8fae8bdbf79.zip op-kernel-dev-535c55df136ad2783d444e54d518a8fae8bdbf79.tar.gz |
dccp tfrc/ccid-3: Computing Loss Rate from Loss Event Rate
This adds a function to take care of the following cases occurring in the
computation of the Loss Rate p:
* 1/(2^32-1) is mapped into 0% as per RFC 4342, 8.5;
* 1/0 is mapped into the maximum of 100%;
* we want to avoid that p = 1/x is rounded down to 0 when x is very large,
since this means accidentally re-entering slow-start (indicated by p==0).
In the last case, the minimum-resolution value of p is returned.
Furthermore, a bug in ccid3_hc_rx_getsockopt is fixed (1/0 was mapped into ~0U),
which now allows to consistently print the scaled p-values as
printf("Loss Event Rate = %u.%04u %%\n", rx_info.tfrcrx_p / 10000,
rx_info.tfrcrx_p % 10000);
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'fs/attr.c')
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