On Fri 07 Oct 2016 03:58:29 PM CEST, Ed Swierk wrote: >> I know the disk image size, and can set cache size in >> bytes. l2-cache-size=max would be a convenience feature, *especially >> if it could become the default*. Then I could forget thinking about >> whether the image is larger than the current 8GB fully-cached >> threshold, and only have to calculate cache size in bytes in case of >> very large images, multiple backing files, or very tight memory. > > Same here, using libvirt. l2-cache-size=max would be ideal. Or if > there were a cache-coverage-size option that takes an absolute number, > libvirt could set it to the image size.
I can see the benefit of both approaches: setting the disk size covered by the cache or setting a percentage, I personally like a bit more the former but it wouldn't provide a way to say "create the largest cache needed for this disk". Would 'l2-cache-coverage-size' work for everyone? It would simply take the disk size (16G, 1T, etc) and it would conflict with l2-cache-size. Do we need something similar for the refcount cache? Berto
