This fix targets to clean the storage code with BUS_DMA interface.
In addition, this can improve the performance 1.35X ~ 2.35x for FIO on hyperv.
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Details
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Diff Detail
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Look fine. Some minors.
| sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c | ||
|---|---|---|
| 1053 | Destroy the map; though it should be no-op in this case. And the maps could also be destroyed on storvsc_detach path. | |
| 1928 | Pass BUS_DMA_NOWAIT as the flag, since the code here assumes the direct running of the callback. And check the return value of bus_dmamap_load_ccb, even though it should not fail here, since no bounce pages will be needed; better safe than sorry. | |