Messages in this thread |  | | Date | Thu, 08 May 2003 19:20:46 -0400 | From | Brian Gerst <> | Subject | Re: 2.5.69 Interrupt Latency |
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Paul Fulghum wrote: > On Thu, 2003-05-08 at 14:22, Andrew Morton wrote: > >>Paul Fulghum <paulkf@microgate.com> wrote: >> >>>On Wed, 2003-05-07 at 17:28, Andrew Morton wrote: >>> >>>>Paul Fulghum <paulkf@microgate.com> wrote: >>>> >>>>>2.5.69 >>>>>Latency 100-110usec (5x increase) >>>>>Spikes from 5-10 milliseconds >>>>> > > >>>I'm going to try your suggestion of doing a stack dump >>>when the driver encounters the large spikes in IRQ latency, >>>to determine if something is leaving interrupts disabled. >> >>I wasn't very informative, alas. > > > Yeah, I've been reading through the 2.5.69 patch again and > could not really see anything that related to the > stack dump. > > >>>That will not address the fact that the minimum >>>latency has jumped from 20usec (2.4.20 - 2.5.68) to 100usec >>>(2.5.69). This may actually be two separate problems >>>introduced with 2.5.69 >> >>Can you pinpoint a kernel version at which it started to happen? > > > Exactly with 2.5.69 > > 2.5.68 works fine as do earlier versions back to 2.4.20-8 > (earliest tested for this problem). All these versions have > very consistant latencies as described above. > > The problem definately started with the 2.5.69 >
Try to narrow it down with the 2.5.68-bk snapshots.
-- Brian Gerst
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