During sequential writes into single file, fs layer is consequently calling ramfs_truncate() function. When file size grows ramfs_truncate() takes more and more time to complete, due to interations through all already written data chunks. As an example loading ~450M image using usb fastboot protocol took over 500s to complete.
Use ramfs_find_chunk() function to search for last chunk of data in ramfs_truncate() implementation, which saves a lot of loop iterations. As a result loading ~450M image using usb fastboot protocol takes around 25s now. Tested-by: Maciej Zagrabski <[email protected]> Signed-off-by: Marcin Niestroj <[email protected]> --- fs/ramfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ramfs.c b/fs/ramfs.c index 7548bdac9..6f4aa0675 100644 --- a/fs/ramfs.c +++ b/fs/ramfs.c @@ -362,6 +362,9 @@ static int ramfs_truncate(struct device_d *dev, FILE *f, ulong size) if (!node->data) return -ENOMEM; data = node->data; + } else { + data = ramfs_find_chunk(node, oldchunks - 1); + newchunks -= (oldchunks - 1); } newchunks--; -- 2.19.0 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
