Messages in this thread | | | Date | Sat, 5 Jul 2003 09:58:06 -0700 (PDT) | From | Ryan Mack <> | Subject | Re: 2.4.21 ServerWorks DMA Bugs |
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That at least explains the lack of DMA, but why does non-DMA IO result in such significant clock skew?
Also, does anybody know what the status of the failure to recognize higher UDMA modes on the CSB5 chipset? Is there a working patch out there?
Thanks again, Ryan
On Sat, 5 Jul 2003, Markus Plail wrote:
> On Fri, 4 Jul 2003, Ryan Mack wrote: > > > I've real the other threads but nothing touches on my specific issue. > > I have a dual P4 Xeon Dell PowerEdge 1600SC with a Fusion MPT SCSI > > controller and a ServerWorks CSB5 IDE chipset. All the HDs are on the > > SCSI bus, and only my CD reader and my DVD writer are on the IDE bus > > (one on each channel). Hyperthreading is enabled (4 logical > > processors). I am using GCC 3.2.2. > > > > The CD readers is the blacklisted 'SAMSUNG CD-ROM SC-148C' and I never > > use it so I can remove it if needed. The DVD writer is a 'SONY DVD RW > > DRU-500A'. Both are going through the ide-scsi driver. Whenever I > > read/write CDs in the DVD writer, I get very high system load (50% on > > one CPU), even though DMA seems to be enabled. > > If you are writing CDs with unusual block sizes (audio CDs, (S)VCDs, > RAW mode -> blocksize != 2048) you won't get DMA with ide-scsi, no > matter what you do. It's simply not supported. - 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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