Andrew Shewmaker <ags...@gmail.com> wrote: > If alpha is strictly reduced by alpha >> dctcp_shift_g and if alpha is less > than 1 << dctcp_shift_g, then alpha may never reach zero. For example, > given shift_g=4 and alpha=15, alpha >> dctcp_shift_g yields 0 and alpha > remains 15. The effect isn't noticeable in this case below cwnd=137, but > could gradually drive uncongested flows with leftover alpha down to > cwnd=137. A larger dctcp_shift_g would have a greater effect. > > This change causes alpha=15 to drop to 0 instead of being decrementing by 1 > as it would when alpha=16. However, it requires one less conditional to > implement since it doesn't have to guard against subtracting 1 from 0U. A > decay of 15 is not unreasonable since an equal or greater amount occurs at > alpha >= 240. > > Signed-off-by: Andrew G. Shewmaker <ags...@gmail.com>
Acked-by: Florian Westphal <f...@strlen.de> [ cwnd=137 is quite large so I don't think its important enough for -stable ]. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
