[PATCH] fetch-pack: grow stateless RPC windows exponentially

[Jonathan Tan <jonathantanmy@google.com>]

When updating large repositories, the LARGE_FLUSH limit (that is, the
limit at which the window growth strategy switches from exponential to
linear) is reached quite quickly. Use a conservative exponential growth
strategy when that limit is reached instead.

This optimization is only applied during stateless RPCs to avoid the
issue raised and fixed in commit
44d8dc54e73e8010c4bdf57a422fc8d5ce709029.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
---
 fetch-pack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fetch-pack.c b/fetch-pack.c
index b501d5c..3fcbda2 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -251,6 +251,8 @@ static int next_flush(struct fetch_pack_args *args, int count)
 
 	if (count < flush_limit)
 		count <<= 1;
+	else if (args->stateless_rpc && count >= flush_limit * 10)
+		count = count * 11 / 10;
 	else
 		count += flush_limit;
 	return count;
-- 
2.8.0.rc3.226.g39d4020