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Re: [lvs-users] ip_vs_send_async error

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] ip_vs_send_async error
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Tue, 15 Dec 2009 18:57:38 +1100
On Tue, Dec 15, 2009 at 02:07:12AM +0200, Aleksey Chudov wrote:
> Hello!
> 
> I have the following parameters set on LVS Master:
> net.core.wmem_max = 16777216
> net.core.wmem_default = 118784
> net.core.rmem_max = 16777216
> net.core.rmem_default = 118784
> 
> # netstat -s
> Udp:
>     12669936 packets received
>     398141 packets to unknown port received.
>     0 packet receive errors
>     47229187 packets sent
>     RcvbufErrors: 0
>     SndbufErrors: 29490577
> 
> 
> How to know correct buffer parameters for 16k conn/ps?
> Is it possible to fix connection sync daemon messages without recompiling
> the krenel?

I wonder if the kernel should be fixed to a) use a lower pause between
batches of sends (its currently HZ = 1s) or b) use a dynamic pause depending
on many packets are being handled.


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