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Re: port-xen/50290: Regression: xennet very slow in netbsd-7

The following reply was made to PR port-xen/50290; it has been noted by GNATS.

From: Stephen Borrill <>
Subject: Re: port-xen/50290: Regression: xennet very slow in netbsd-7
Date: Wed, 30 Sep 2015 09:52:40 +0100 (BST)

 On Tue, 29 Sep 2015, Stephen Borrill wrote:
 > This is down to options MBUFTRACE. On netbsd-5 this has little or no impact. 
 > On netbsd-7, it kills performance. Is this a bug or expected?
 I've tested on physical hardware with kernels from the same 
 versions of the source tree. MBUFTRACE has no effect with non-xennet 
 Packet size  1k bytes:  100650 KByte/s Tx,  91729 KByte/s Rx.
 Packet size  2k bytes:  107367 KByte/s Tx,  106770 KByte/s Rx.
 Packet size  4k bytes:  109194 KByte/s Tx,  109567 KByte/s Rx.
 Packet size  8k bytes:  104674 KByte/s Tx,  108502 KByte/s Rx.
 Packet size 16k bytes:  107622 KByte/s Tx,  110378 KByte/s Rx.
 Packet size 32k bytes:  108061 KByte/s Tx,  111504 KByte/s Rx.

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