Re: [PATCH 00/23] per device dirty throttling -v8

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On Sat, 4 Aug 2007, Ray Lee wrote:

On 8/4/07, [email protected] <[email protected]> wrote:
On Sat, 4 Aug 2007, Ingo Molnar wrote:

At least on a surface level, your report has some similarities to
http://lkml.org/lkml/2007/5/21/84 . In that message, John Miller
mentions several things he tried without effect:

< - I increased the max allowed receive buffer through
< proc/sys/net/core/rmem_max and the application calls the right
< syscall. "netstat -su" does not show any "packet receive errors".
mercury1:/proc/sys/net/core# cat rmem_*
124928
131071
mercury1:/proc/sys/net/core# netstat -su
Udp:
    697853177 packets received
    10025642 packets to unknown port received.
    191726680 packet receive errors
    63194 packets sent
    RcvbufErrors: 191726680
UdpLite:
mercury1:/proc/sys/net/core# echo "512000" >rmem_max

< - After getting "kernel: swapper: page allocation failure.
< order:0, mode:0x20", I increased /proc/sys/vm/min_free_kbytes
I have not seen any similar errors

< - ixgb.txt in kernel network documentation suggests to increase
< net.core.netdev_max_backlog to 300000. This did not help.
mercury1:/proc/sys/net/core# cat netdev_*
300
1000
mercury1:/proc/sys/net/core# echo "300000" >netdev_max_backlog

< - I also had to increase net.core.optmem_max, because the default
< value was too small for 700 multicast groups.
I'm not running multicast.

As they're all pretty simple to test, it may be worthwhile to give
them a shot just to rule things out.
unfortunantly the load is not high enough right now to see a real
difference (it's only doing ~1400 logs/sec) I'll catch it at a higher load
point to see if these make any difference.
David Lang

Ray

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