Hi all,
https://www.kernel.org/doc/Documentation/bcache.txt reports
freelist_percent
Size of the freelist as a percentage of nbuckets. Can be written to to
increase the number of buckets kept on the freelist, which lets you
artificially reduce the size of the cache at runtime. Mostly for testing
purposes (i.e. testing how different size caches affect your hit
rate), but
since buckets are discarded when they move on to the freelist will
also make
the SSD's garbage collection easier by effectively giving it more
reserved
space.
However, on dec. 17, 2013, the allocator reserves got reworked and this
option disappeared.
We're currently rolling out bcache on a number of older Intel SSD's
which are notoriously bad on the GC part; they practically *need* a big
chunk of reserved space to function properly.
Of course we could go with a HPA or a smaller partition, but it'd be
much more elegant to do this from within bcache itself; so is this still
possible , now that this option obviously no longer exists, and if so, how?
Thanks in advance!
Ronald
--
To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
