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Re: [Xen-devel] Increase txqueuelen of vif devices
| To: | Miroslav Rezanina <mrezanin@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Increase txqueuelen of vif devices |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Fri, 22 Oct 2010 11:22:49 +0100 |
| Cc: | |
| Delivery-date: | Fri, 22 Oct 2010 03:23:46 -0700 |
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| Thread-topic: | [Xen-devel] Increase txqueuelen of vif devices |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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