h2o: Reduce the size of the default HTTP2 buffer

The initial value takes 80kB of memory for each HTTP/2 connection which is a lot on small devices. Using 8kB instead saves a fair amount of memory without sacrificing performance. Signed-off-by: Remi Gacogne <[email protected]>
sebastian-de · Jun 22, 2023 · b53a838 · b53a838
1 parent 1246b81
commit b53a838
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/libs/h2o/patches/800-smaller-write-buffer.patch b/libs/h2o/patches/800-smaller-write-buffer.patch
@@ -0,0 +1,11 @@
+--- a/include/h2o/http2_internal.h
++++ b/include/h2o/http2_internal.h
+@@ -33,7 +33,7 @@
+ typedef struct st_h2o_http2_conn_t h2o_http2_conn_t;
+ typedef struct st_h2o_http2_stream_t h2o_http2_stream_t;
+
+-#define H2O_HTTP2_DEFAULT_OUTBUF_SIZE 81920 /* the target size of each write call; connection flow control window + alpha */
++#define H2O_HTTP2_DEFAULT_OUTBUF_SIZE 8192 /* the target size of each write call; connection flow control window + alpha */
+ #define H2O_HTTP2_DEFAULT_OUTBUF_SOFT_MAX_SIZE 524288 /* 512KB; stops reading if size exceeds this value */
+
+ /* hpack */