Re: Problem with large files on different OSes

Something like the following may also work, as a more generic "just don't 
even bother trying to delta huge files".

Totally untested. Maybe it works. Maybe it doesn't.

		Linus

---
 Documentation/config.txt |    7 +++++++
 builtin-pack-objects.c   |    9 +++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2c03162..8c21027 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt

@@ -1238,6 +1238,13 @@ older version of git. If the `{asterisk}.pack` file is smaller than 2 GB, howeve
 you can use linkgit:git-index-pack[1] on the *.pack file to regenerate
 the `{asterisk}.idx` file.
 
+pack.packDeltaLimit::
+	The default maximum size of objects that we try to delta.

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index 9742b45..9a0072b 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c

@@ -85,6 +85,7 @@ static struct progress *progress_state;
 static int pack_compression_level = Z_DEFAULT_COMPRESSION;
 static int pack_compression_seen;
 
+static unsigned long pack_delta_limit = 64*1024*1024;
 static unsigned long delta_cache_size = 0;
 static unsigned long max_delta_cache_size = 0;
 static unsigned long cache_max_small_delta_size = 1000;

@@ -1270,6 +1271,10 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
 	if (trg_entry->type != src_entry->type)
 		return -1;
 
+	/* If we limit delta generation, don't even bother for larger blobs */
+	if (pack_delta_limit && trg_entry->size >= pack_delta_limit)
+		return -1;