Hi Tom, On 04/01/2016 06:59 PM, Tom Rini wrote: > On Mon, Mar 28, 2016 at 10:05:44AM -0700, Eric Nelson wrote: > >> Add a block device cache to speed up repeated reads of block devices by >> various filesystems. >> >> This small amount of cache can dramatically speed up filesystem >> operations by skipping repeated reads of common areas of a block >> device (typically directory structures). >> >> This has shown to have some benefit on FAT filesystem operations of >> loading a kernel and RAM disk, but more dramatic benefits on ext4 >> filesystems when the kernel and/or RAM disk are spread across >> multiple extent header structures as described in commit fc0fc50. >> >> The cache is implemented through a minimal list (block_cache) maintained >> in most-recently-used order and count of the current number of entries >> (cache_count). It uses a maximum block count setting to prevent copies >> of large block reads and an upper bound on the number of cached areas. >> >> The maximum number of entries in the cache defaults to 32 and the maximum >> number of blocks per cache entry has a default of 2, which has shown to >> produce the best results on testing of ext4 and FAT filesystems. >> >> The 'blkcache' command (enabled through CONFIG_CMD_BLOCK_CACHE) allows >> changing these values and can be used to tune for a particular filesystem >> layout. >> >> Signed-off-by: Eric Nelson <e...@nelint.com> > > Applied to u-boot/master, thanks! >
Whoops. I have a couple of minor updates from Stephen's last review that I'll forward shortly. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
