On Sun, Dec 06, 2009 at 12:10:13AM +0000, Alexander Motin wrote: > Author: mav > Date: Sun Dec 6 00:10:13 2009 > New Revision: 200171 > URL: http://svn.freebsd.org/changeset/base/200171 > > Log: > MFp4: > Introduce ATA_CAM kernel option, turning ata(4) controller drivers into > cam(4) interface modules. When enabled, this options deprecates all ata(4) > peripheral drivers (ad, acd, ...) and interfaces and allows cam(4) drivers > (ada, cd, ...) and interfaces to be natively used instead. > > As side effect of this, ata(4) mode setting code was completely rewritten > to make controller API more strict and permit above change. While doing > this, SATA revision was separated from PATA mode. It allows DMA-incapable > SATA devices to operate and makes hw.ata.atapi_dma tunable work again. > > Also allow ata(4) controller drivers (except some specific or broken ones) > to handle larger data transfers. Previous constraint of 64K was artificial > and is not really required by PCI ATA BM specification or hardware.
are there any performance benefits of the 64K limit removal? _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
