Bug 154206 - Disabling DEBUG_PAGEALLOC cripples network
Disabling DEBUG_PAGEALLOC cripples network
Status: CLOSED UPSTREAM
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
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i686 Linux
medium Severity medium
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Assigned To: Dave Jones
Brian Brock
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Depends On:
Blocks:
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Reported: 2005-04-08 08:55 EDT by nick_smith67
Modified: 2015-01-04 17:18 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2005-04-11 18:16:48 EDT
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Description nick_smith67 2005-04-08 08:55:06 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225

Description of problem:
Multiple symptoms of poor/erratic network performance and failure
                                                                                
1) Pinging default gateway - 25-50% packet loss, clusters of 4-5 RTT's in excess of 5sec. During periods of long RTT, top shows significant ksoftirqd CPU utilization. Eventually, no response from gateway at all (a few "destination unreachable" - or similar type responses from eth0's address). A "service network restart" brings it back again, but erratic ping performance is still there. No obvious
errors logged.
                                                                                
2) Most websites load slowly if at all
                                                                                
3) Tools such as yum report multiple socket timeouts irrespective of destination. Download streams frequently pause for long periods if they work at all
                                                                                
Re-enabling DEBUG_PAGEALLOC causes the network to behave normally

Version-Release number of selected component (if applicable):
kernel-2.6.11-1.1225_FC4 and later

How reproducible:
Always

Steps to Reproduce:
1.Boot kernel-smp-2.6.11-1.1225_FC4 or later patched with vendor driver
2.
3.
  

Actual Results:  Network became effectively useless

Expected Results:  Network works

Additional info:

Motherboard is an Asus P5AD2-E Premium which comes with onboard Marvell PCIe 88E8053. The sk98lin driver shipped with the kernel does not work with this chip which it does not seem to recognize. The new skge driver currently being developed in net-dev doesn't work either, so it is necessary to use a vendor provided sk98lin driver (http://www.syskonnect.com/syskonnect/support/driver/zip/linux/install-8_15.tar.bz2) with a minor patch to make it use pci_name instead of slot_name
Comment 1 Dave Jones 2005-04-11 18:16:48 EDT
sounds like an issue you need to take up with the driver authors.
This way it'll hopefully get fixed up before it hits Linus' tree (and
subsequently Fedora).

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