Messages in this thread | | | Date | Tue, 25 Aug 1998 18:03:50 +0200 | From | Harald Koenig <> | Subject | Re: SCSI tape blocks > 128k ? |
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On Aug 25, Alan Cox wrote:
> > http://samba.anu.edu.au/cgi-bin/linux-patches/incoming?id=267 > > > > The patch implements the bigbuffer support required for this use, and > > patches "sg" to actually use it. A two-line patch will allow st to > > also use this...... > > Its a workable answer, but not the right one. The right one is to propogate > the use of scatter gather better and eventually (2.3.x I hope) DMA to > user pages. Modern SCSI controllers dont need 1Mbyte of linear memory > for this. And non DMA old ones are generally sufficiently dumb you can > implement scatter gather in the cpu driven byte copy routines
but at least my setup is just in the middle of these two extremes: the DAT is connected to a good old AHA1542B (it's only for external devices which can be hot-plughed without risk; I don't need to touch the SCSI bus for faster disks), so I need DMA and can't use scatter gather (AFAIK)...
having bigbuffer support addtional to a better scatter gather method for more recent hardware would be the best thing[tm] (and that's what Linux is trying to be, isn't it?;)
Harald -- All SCSI disks will from now on ___ _____ be required to send an email notice 0--,| /OOOOOOO\ 24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\ \ \/OOOOOOOOOOOOOOO\ \ OOOOOOOOOOOOOOOOO|// Harald Koenig, \/\/\/\/\/\/\/\/\/ Inst.f.Theoret.Astrophysik // / \\ \ koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
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