Re: [Xen-devel] Increase txqueuelen of vif devices

[Keir Fraser <keir@xxxxxxx>]

The expectation was that domU would push enough receive buffers to dom0 to
avoid packet loss. The txqueuelen is just a fallback for that. Still, yeah,
it could be increased if it improves perf given default domU netfront
behaviour.

 -- Keir


On 22/10/2010 10:35, "Miroslav Rezanina" <mrezanin@xxxxxxxxxx> wrote:

> During performance testing we find out that increasing txqueuelen can increase
> throughput significantly. Following table shows our results:
> 
> txQlen     netperf message size
>         512 byte        4096 byte
> -----------------------------------
> 32      1634.13          8402.32
> 64      1292.05         14198.48
> 128     4142.58         14677.39
> 256     4439.77         14626.80
> 512     5251.48         14809.59
> 1024    4875.96         15358.55
> 
> 
> Based on this result, shouldn't be good idea to change default txqueuelen?
> Physical devices uses txqueuelen of 1000.
> 
> Regard,
> Mirek



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