On 12/8/06, Dirk Behme <[EMAIL PROTECTED]> wrote:
Ingo Molnar wrote:
> this is a fixes-only release. Changes since -rt1:
...
> - e1000: update to driver 7.3.15-k2 to fix latency problem
Any hint what the "latency problem" was here?
On ARM926 with patch-2.6.19-rt10 we use SMC91C94 ethernet
(smc91x.c). With rt10 applied we get NETDEV WATCHDOG
transmit timouts (see below) while using NFS. We don't get
them without rt patch.
I've seen the same problem on the ARM versatile926 with the
2.6.14 vintage RT patches. My problem was due to the generic
IRQ changes and I could reproduce the problem with just those
patches applied.
A brew of the following two patches got the versatile's TX
interrupts firing again:
http://lkml.org/lkml/2005/12/12/69
http://lkml.org/lkml/2005/12/12/72
Obviously those are a bit old now and I haven't gotten around
to trying the board with the 2.6.19-rt patches (no suitable
counter for instrumentation), so I haven't checked for myself
to see if the problem still exists.
Dirk
Btw: Any idea why /proc/interrupts doesn't look like Figure
8 of http://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO ?
The [........N/ 0] info is missing here.
eth0: SMC91C94 (rev 9) at c2850300 IRQ 160 [nowait]
eth0: Ethernet addr: 00:0e:99:02:02:42
# cat /proc/interrupts
CPU0
...
93: 0 MPU DMA
94: 0 MPU DMA
160: 28 GPIO eth0
164: 1 GPIO spi2.0
197: 0 GPIO serial wakeup
...
# madplay /mnt/nfs/foo.mp3
...
NETDEV WATCHDOG: eth0: transmit timed out
NETDEV WATCHDOG: eth0: transmit timed out
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server 192.0.0.1 not responding, still trying
nfs: server 192.0.0.1 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server 192.0.0.1 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server 192.0.0.1 not responding, still trying
nfs: server 192.0.0.1 not responding, still trying
nfs: server 192.0.0.1 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
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