3 files changed, 6 insertions, 3 deletions
diff --git a/ccache.h b/ccache.h
index f0839b3d..9194f233 100644
--- a/ccache.h
+++ b/ccache.h
@@ -75,6 +75,9 @@ enum stats {
 	(strlen(s) >= strlen(suffix) \
 	 && str_eq((s) + strlen(s) - strlen(suffix), (suffix)))
 
+/* buffer size for IO operations */
+#define READ_BUF_SZ (1<<18)
+
 // ----------------------------------------------------------------------------
 // args.c
 
diff --git a/hash.c b/hash.c
index 9cc2026c..398a5d40 100644
--- a/hash.c
+++ b/hash.c
@@ -97,7 +97,7 @@ hash_int(struct mdfour *md, int x)
 bool
 hash_fd(struct mdfour *md, int fd)
 {
-	char buf[16384];
+	char buf[READ_BUF_SZ];
 	ssize_t n;
 
 	while ((n = read(fd, buf, sizeof(buf))) != 0) {
diff --git a/util.c b/util.c
index 6ef7ba7f..acc43ab9 100644
--- a/util.c
+++ b/util.c
@@ -197,7 +197,7 @@ copy_fd(int fd_in, int fd_out)
 	}
 
 	int n;
-	char buf[10240];
+	char buf[READ_BUF_SZ];
 	while ((n = gzread(gz_in, buf, sizeof(buf))) > 0) {
 		ssize_t written = 0;
 		do {
@@ -297,7 +297,7 @@ copy_file(const char *src, const char *dest, int compress_level)
 	}
 
 	int n;
-	char buf[10240];
+	char buf[READ_BUF_SZ];
 	while ((n = gzread(gz_in, buf, sizeof(buf))) > 0) {
 		int written;
 		if (compress_level > 0) {