[PATCH] tools: copyfile: use 64k instead of 512 buffer

[Ahelenia Ziemiańska]

This is an incredible pessimisation:
mkimage took >200ms (and 49489 writes (of which 49456 512)),
now it takes  110ms (and   419 writes (of which   386 64k)).

sendfile is much more appropriate for this and is done in one syscall,
but doesn't bring any significant speedups over 64k r/w
at the 13M size ranges, so there's no need to introduce
        #if __linux__
        while((size = sendfile(fd_dst, fd_src, NULL, 128 * 1024 * 1024)) > 0)
                ;
        if(size != -1) {
                ret = 0;
                goto out;
        }
        #endif

Signed-off-by: Ahelenia Ziemiańska <nabijaczlew...@nabijaczleweli.xyz>
---
 tools/fit_common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/fit_common.c b/tools/fit_common.c
index 2d417d47..373fab6a 100644
--- a/tools/fit_common.c
+++ b/tools/fit_common.c
@@ -145,14 +145,14 @@ int copyfile(const char *src, const char *dst)
                goto out;
        }
 
-       buf = calloc(1, 512);
+       buf = calloc(1, 64 * 1024);
        if (!buf) {
                printf("Can't allocate buffer to copy file\n");
                goto out;
        }
 
        while (1) {
-               size = read(fd_src, buf, 512);
+               size = read(fd_src, buf, 64 * 1024);
                if (size < 0) {
                        printf("Can't read file %s\n", src);
                        goto out;
-- 
2.39.2

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