![]() | ||||||||||
Messages in this thread |
On 29 Nov 2002, Alan Cox wrote: > On Fri, 2002-11-29 at 13:17, Rasmus Bøg Hansen wrote: > > I just tried turning off DMA on the server disk (this is just a low-end > > IDE-system): No errors in files (compressing the file thrice). > > > > So it does not at all seem to be a NFS-issue! > > > > I have no idea what is wrong. If the disk, cable or IDE controller does > > bit-flipping when DMA is turned on, why is the problem only seen with > > NFS? I have never seem corrupted files or metadata with DMA turned > > (except once long ago, when I experimented with high-transfer-modes - I > > haven't done that since)... > > More likely it changes the timings. There is at least one other > possibility though. With some via bridges using slightly too slow DDR > RAM at a 133MHz clock works reliably _until_ you get a mix of CPU and > DMA traffic. It'll even pass memtest86. This is not DDR, it is SD-RAM (K6-2/300, 256MB SD-RAM in one stick). But there is not much CPU traffic when making the files. The NFS-client is doing the compression, but the corruption seems to happen on the NFS-server (at least I can avoid it by turning off DMA on teh NFS server), which has not got any special CPU usage at that time. > So if its a VIA box, turn DMA back on, stick the bios into its load > failsafe defaults mode and see if that has an affect. I will try to look into BIOS settings (it does not have a 'load failsafe option' IIRC, but I'm pretty sure I can change RAM timings) - but I won't be near the machine before tomorrow. Regards /Rasmus -- -- [ Rasmus "Møffe" Bøg Hansen ] --------------------------------------- There is no insanity, just different perceptions of reality. ----------------------------------[ moffe at amagerkollegiet dot dk ] -- - 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/ | |||||||||
| Last update: 2005-03-22 12:31 [from the cache] ©2003-2008 | ||||||||||