Hi, On 09.02.2017 23:17 Eric Wheeler wrote: > Well, I don't know about "good enough" but I can say that the current > bcache v1 asynchronous block IO performance is wonderful. It seems to me > that loopN's are confined to a single thread and incur pagecache > duplication (maybe better with DIO loops, but that was always very slow in > my testing). > > So, if its easy enough to get bcachefs to export blockdevs then it would > be neat to benchmark bcachefs snapshots vs dm-thin volumes. Compression > is definitely a win here feature-wise. This would make bcachefs the first > compressed block device without loop in Linux when it gets merged! Did you test this with kernel >=4.4 and losetup --direct-io=on ? This makes loop use direct, async IO which is much faster and doesn't double cache. So it might indeed be a distraction to pull this into bcachefs. Regards, Martin Raiber
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