On 2/20/19 9:10 PM, Damien Le Moal wrote: > This patch series fixes various problems with fio zbd support discovered > with extensive testing on various test targets (null_blk, iscsi/tcmu > device, SMR disk, partition devices, etc). > > In more details: > * Patch 1 fixes the discovery of a block device zone model to correctly > handle block devices that are partitions. > * Patch 2 addresses a problem with the SG engine and devices not > supporting the READ CAPACITY(10) command. > * Patch 3 cleans up the SG engine code with helper functions to handle > big-endian SCSI cdb fields. > * Patch 4 to 6 fix the zbd support tests to avoid incorrect failures > reports. > * Patch 7 and 8 fix zone locking handling to avoid write command > reordering with multi-jobs workloads with asynchronous I/O engines. > These changes do have a significant impact on the performance reported > for very small (test) devices with a high number of jobs. The worst > degradation observed result in libaio performance being equal to that > of the synchronous psync engine. There is however no noticeable > performance degradation with real disks as the large number of zones > with these drives do not cause excessive zone lock contention. > * Patch 9 introduces a new zbd test case 46 to test asynchronous > muli-job writes. > > All these fixes are necessary for correctly running blktests with > different target devices, and to also implement further blktests > zbd test group to improve test coverage. > > As always, comments are very welcome. Applied, thanks. -- Jens Axboe
