Shawn O. PearceIf multi_ack_detailed was selected in the protocol capabilities (both client and server are >= Git 1.6.6) the upload-pack side will send "ACK %s ready" when it knows how to safely cut the graph and produce a reasonable pack for the want list that was already sent on the connection.
Upon receiving "ACK %s ready" there is no point in looking at the remaining commits inside of rev_list. Sending additional "have %s" lines to the remote will not construct a smaller pack. It is unlikely a commit older than the current cut point will have a better delta base than the cut point itself has.
The original design of this code had fetch-pack empty rev_list by marking a commit and its transitive ancestors COMMON whenever the remote side said "ACK %s {continue,common}" and skipping over any already COMMON commits during get_rev(). This approach does not work when most of rev_list is actually COMMON_REF, commits that are pointed to by a reference on the remote, which exist locally, and which have not yet been sent to the remote as a "have %s" line.
Most of the common references are tags in the ref/tags namespace, using points in the commit graph that are more than 1 commit apart. In git.git itself, this is currently 340 tags, 339 of which point to commits in the commit graph. fetch-pack pushes all of these into rev_list, but is unable to mark them COMMON and discard during a remote's "ACK %s {continue,common}" because it does not parse through the entire parent chain. Not parsing the entire parent chain is an optimization to avoid walking back to the roots of the repository.
Assuming the client is only following the remote (and does not make its own local commits), the client needs 11 rounds to spin through the entire list of tags (32 commits per round, ceil(339/32) == 11). Unfortunately the server knows on the first "have %s" line that it can produce a good pack, and does not need to see the remaining 320 tags in the other 10 rounds.
Over git:// and ssh:// this isn't as bad as it sounds, the client is only transmitting an extra 16,000 bytes that it doesn't need to send.
Over smart HTTP, the client must do an additional 10 HTTP POST requests, each of which incurs round-trip latency, and must upload the entire state vector of all known common objects. On the final POST request, this is 16 KiB worth of data.
Fix all of this by clearing rev_list as soon as the remote side says it can construct a pack.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org> ---
Fixed bad indentation that appeared in v1.
builtin/fetch-pack.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
Show changes to builtin/fetch-pack.c +2 −0
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c index b999413..5173dc9 100644 --- a/builtin/fetch-pack.c +++ b/builtin/fetch-pack.c @@ -379,6 +379,8 @@ static int find_common(int fd[2], unsigned char *result_sha1, retval = 0; in_vain = 0; got_continue = 1; + if (ack == ACK_ready) + rev_list = NULL; break; } }
-- 1.7.4.1.35.ga52fb.dirty