Messages in this thread | | | Date | Mon, 25 Jun 2007 19:40:26 -0400 | From | Chris Snook <> | Subject | Re: [PATCH] atl1: disable 64bit DMA |
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Jeff Garzik wrote: > Jay Cliburn wrote: >> On Mon, 25 Jun 2007 17:57:20 -0400 >> Chris Snook <csnook@redhat.com> wrote: >> >>> Jay L. T. Cornwall wrote: >>>> Chris Snook wrote: >>>> >>>>> What boards have we seen this on? It's quite possible this is: >>>> I can reproduce on an Asus P5K with a Core 2 Duo E6600. >>>> >>>> lspci identifies the controller as: >>>> 02:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit >>>> Ethernet Adapter (rev b0) >>>> >>>> dmesg notes the PCI-DMA mapping implementation: >>>> PCI-DMA: Using software bounce buffering for IO (SWIOTLB) >>>> >>> I had a hunch this was on Intel. I'd rather just disable this when >>> swiotlb is in use, unless we get more complaints. It's probably >>> ultimately a BIOS quirk anyway. >> >> So far we have reports from both camps: >> >> Asus M2N8-VMX (AM2): 1 report of lockup >> http://sourceforge.net/mailarchive/forum.php?thread_name=46780384.063603.26165%40m12-15.163.com&forum_name=atl1-devel >> >> >> Asus P5K (LGA775): 2 reports of lockups >> http://sourceforge.net/mailarchive/forum.php?thread_name=467E7E34.4010603%40gmail.com&forum_name=atl1-devel >> >> http://lkml.org/lkml/2007/6/25/107 >> >> The common denominator in these reports is 4GB RAM. > > Although its possible this device doesn't really support 64-bit, it's > more likely that this is a platform problem of some sort, or a driver > bug of some sort. In the driver, maybe it has a problem when you > -cross- a 4GB boundary, which is not uncommon. > > Jeff
I'm going on the record to say I don't trust the chipsets on these boards, and I'd like anyone having these problems to let us (atl1-devel@lists.sourceforge.net) know if they encounter similar problems with any other hardware. That said, I'm not going to stand in the way of stability just because it *might* be someone else's fault. I don't think limiting ourselves to dma32, at least while we track this down, is much of a loss on current hardware.
Acked-By: Chris Snook <csnook@redhat.com> - 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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