On 2017-04-05, 7:14 PM, "Jens Axboe" <axboe@xxxxxxxxx> wrote: > Why not just have 8 buckets, and make it: > > bucket = ddir + ilog2(bytes) - 9; > > and cap it at MAX_BUCKET (8) and put all those above into the top > bucket. Thanks. However, that equation does not differentiate between direction and size. Instead we can use bucket = ddir + 2*(ilog2(bytes) - 9); and then bin any IO over 64K in the largest of the two buckets based on direction. I’ll implement this in a v3…. Cheers Stephen
