hi,Chris£¬ ÔÚ 2001-12-05 14:25:00 you wrote£º >Zhang Fuxin wrote: >> >> hi,Chris£¬ >> you can do anything you like to my code:) >> i have promised to release it months ago,but so busy I was the past >> months and i am shy to release ugly code. Sorry if it waste you time. > > Thanks. We've followed very similar routes so there aren't so many >differences :-) > >> >> Today I make some tests and get some fixes ,log is here >> (i was too sleepy last night,so most of them is stupy errors): >> 2001.12.05: >> arch/mips/defconfig-p6032: >> ide dma unstable,don't choose 'use dma by default when available' > > Yes. I have had a look at this but haven't tracked it down yet. The >only thing I know is that the buffer heads get corrupted, so I assume >there is some interrupt locking problem somewhere. I know that DMA >works in the MIPS 2.4.3 port. Were you using DMA in your 2.4.8 kernel? Yes,it works well,at least much more stable for 2.4.16,a simple 'mtest01 -p80 -w'(alloc 80% memory to write) test can break the ide dma. > >> you probably will be more able to deal with the dma and board cache > > Do you use the IOBC? I had to make some changes to pci.h and the >ethernet driver to make them work properly. No. I had to make changes to generic code:),that's why i disable it. > >> than me:). The spurious interrupt problem still there,i have added some >> code to work around it but don't know the reason. > > The spurious interrupts are caused by posted writes to PCI devices. >The sequence is usually something like: > o write device to clear interrupt (write gets posted) > o enable CPU interrupts (interrupt is still pending) > o CPU enters interrupt handler and reads 8259 which causes posted >write > to be flushed and so now there is no interrupt... > > The only fix is to do an explicit PCI (eg ISA port) before reenabling >interrupts. The 2.4.x kernel reenables interrupts more quickly than the >older kernel which is why it is more noticeable. > Oh, thanks for your explanation. >> >> I have made a quick test with ltp, most of them passed,but some of >> the fs test and the syscall test failed,i will look into them soon >> if you have interest,i can give you more detail results > > I've not used ltp, but if you do find anything useful I would be >interested. > ok,i will let you know if something found > Regards > Chris > >-- >Algorithmics,The Fruit Farm,Ely Road,Chittering,CAMBS CB5 9PH,ENGLAND >P: +44 1223 706200 F: +44 1223 706250 W: http://www.algor.co.uk Regards Zhang Fuxin fxzhang@ict.ac.cn
