On Sun, 2014-01-12 at 13:53 +0200, Sagi Grimberg wrote: > <SNIP> > > >> I wander how we can skip sbc_dif_verify_xxxx if the transport already > >> offloaded DIF verify. > >> I think that the transport should signal the core layer that it is able > >> to offload DIF (ADD/STRIP/PASS/VERIFY), in which case the core should > >> turn off the backstore DIF verify emulation to sustain performance. > > So IBLOCK + PSCSI backends will need to be a non interleaved protection > > PASS for fast path operation, and backend protection emulation is > > reserved for RAMDISK and perhaps a special FILEIO full emulation mode. > > But can't we avoid that if transport already verified? This will kill > performance. >
Sure, this will end up being configurable per backend if the fabric does a CHECK + STRIP, or CHECK + PASS. --nab -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
