On Sat, Nov 21, 2009 at 03:16:05PM -0500, Martin K. Petersen wrote: > I was trying to help Eric figure out why his drive pooped on big Trim > requests. For WRITE SAME the limit is inherent in the arguments, > whereas our SATL implementation is limited by the 512-byte WRITE SAME > payload. So I needed a way to convey this up the stack. > > Since you already return a B0 VPD page I thought it would be a > convenient place to communicate the max without having to tweak the > queue limits directly from within libata. > > You are right that I'm relying on fuzziness in SBC which requires both > the max LBA count and the descriptor count to be specified for UNMAP. I think the better way is to make sure we can support any TRIM that can be sent down. Given that TRIM is not NCQ-capable we can just allocate one buffer for the TRIM ranges per TRIM capable device. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
