Messages in this thread | | | Date | Wed, 21 Dec 2005 16:17:32 -0200 | From | Marcelo Tosatti <> | Subject | Re: [PATCH 2.4.x] prevent emulated SCSI hosts from wasting DMA memory |
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On Thu, Dec 01, 2005 at 11:36:10AM +0000, Christoph Hellwig wrote: > On Wed, Nov 30, 2005 at 11:02:23PM +0200, Dan Aloni wrote: > > On Wed, Nov 30, 2005 at 07:33:47PM +0000, Luke-Jr wrote: > > > On Wednesday 30 November 2005 17:15, Dan Aloni wrote: > > > > Emulated scsi hosts don't do DMA, so don't unnecessarily increase > > > > the SCSI DMA pool. > > > > > > They don't? Recently I learned(?) that apparently using hdparm -d on the > > > old /dev/hdX device still worked/applied when using ide-scsi... or do > > > "emulated scsi hosts" refer to something else? > > > > Actually by 'do DMA' I meant use the scsi_malloc() interface - which > > is mostly used by low level drivers. The IDE drivers allocate their > > DMA memory outside the SCSI layer. iSCSI hosts for instance, don't > > need to cause unnecessary DMA allocations. > > (1) there's no guranteee a driver setting ->emulated can't use scsi_malloc > (2) 2.4.x is very late in the cycle so there's just no point in putting this > in (and in 2.6.x scsi_malloc is gone fortunately)
Agreed - this does not sound like a critical bug fix to me. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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