On Mon, Jul 16 2007, Kai Makisara wrote: > On Mon, 16 Jul 2007, Martin K. Petersen wrote: > > > >>>>> "John" == John Stoffel <[EMAIL PROTECTED]> writes: > > > > John> Will this help out tape drive performance at all? I looked > > John> through the patches quickly, esp the AIC7xxx stuff since that's > > John> what I use, but nothing jumped out at me... > > > > Yes. Most modern tape drives want a block size of 1MB or higher. > > With the old stack we'd be stuck at 512KB because the sg limitations > > caused us to come just short of 1MB... > > > Tape block sizes up to 16 MB have been possible for a very long time but > this has required tuning of the block/scsi parameters. Very few people > seem to have done this and the common (mis)belief seems to be that the > tape block size limit has been 512 kB. It is good if this tuning is not > needed in future.
The main difference is now you get to do it without hacks and in a clean way, so it works through the normal IO path and not some on-the-side thing (or st only). -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
