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From: Sean McNeil <sean@mcneil.com>
To: Shunsuke SHINOMIYA <shino@fornext.org>
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References: <20041119185315.C43D.SHINO@fornext.org>
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Date: Sun, 21 Nov 2004 09:27:29 -0800
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cc: freebsd-stable@freebsd.org
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cc: Jeremie Le Hen <jeremie@le-hen.org>
Subject: Re: Re[2]: serious networking (em) performance (ggate and NFS)
	problem
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On Sun, 2004-11-21 at 21:27 +0900, Shunsuke SHINOMIYA wrote:
>  Jeremie, thank you for your comment.
>=20
>  I did simple benchmark at some settings.
>=20
>  I used two boxes which are single Xeon 2.4GHz with on-boarded em.
>  I measured a TCP throughput by iperf.
>=20
>  These results show that the throughput of TCP increased if Interrupt
> Moderation is turned OFF. At least, adjusting these parameters affected
> TCP performance. Other appropriate combination of parameter may exist.

I have found interrupt moderation to seriously kill gigE performance.
Another test you can make is to have the driver always defrag packets in
em_encap().  Something like

		m_head =3D m_defrag(*m_headp, M_DONTWAIT);
		if (m_head =3D=3D NULL)
			return ENOBUFS;


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