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SubjectRe: 2.[45] fixes for design locking bug in wait_on_page/wait_on_buffer/get_request_wait
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Hi Andrea,

I've applied your patch to 2.4.19 final and 2.4.20 final and those "pausings"
still exists when I do a full kernel tree copy with "cp -a linux-2.4.19
linux-2.4.20". When I am in a screen session and try to do a Ctrl-A-C to
create a new screen session it comes up within 3-5 seconds ... If I want to
switch to another session with Ctrl-A-N it sometimes happens fast and
sometimes within 3-5 seconds ... I've put above in a "while true; do ...;
done" loop. There is nothing else running or eating CPU and also nothing else
eating i/o. This does not happen with virgin 2.4.18.
This is with a Celeron Tualatin 1300MHz, i815 chipset, 512MB RAM, UDMA100 HDD,
DMA enabled.


/dev/hda:

multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 7299/255/63, sectors = 117266688, start = 0

Model=MAXTOR 6L060J3, FwRev=A93.0500, SerialNo=663219752652
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
BuffType=DualPortCache, BuffSize=1819kB, MaxMultSect=16, MultSect=16
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=117266688
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1: 1 2 3 4 5
Does also appear if unmaskirq is set to 1.

ciao, Marc

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