Date: Sun, 21 Nov 2004 09:27:29 -0800 From: Sean McNeil <sean@mcneil.com> To: Shunsuke SHINOMIYA <shino@fornext.org> Cc: Jeremie Le Hen <jeremie@le-hen.org> Subject: Re: Re[2]: serious networking (em) performance (ggate and NFS) problem Message-ID: <1101058049.12022.5.camel@server.mcneil.com> In-Reply-To: <20041121205158.45CE.SHINO@fornext.org> References: <20041119185315.C43D.SHINO@fornext.org> <20041119120102.GM69710@obiwan.tataz.chchile.org> <20041121205158.45CE.SHINO@fornext.org>
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[-- Attachment #1 --] On Sun, 2004-11-21 at 21:27 +0900, Shunsuke SHINOMIYA wrote: > Jeremie, thank you for your comment. > > I did simple benchmark at some settings. > > I used two boxes which are single Xeon 2.4GHz with on-boarded em. > I measured a TCP throughput by iperf. > > 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 = m_defrag(*m_headp, M_DONTWAIT); if (m_head == NULL) return ENOBUFS; [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQBBoNAByQsGN30uGE4RAhSXAKDEgYADxq+/EmcCYap8FGRlCgI8/ACeLxz/ w7l/SkoYwwZfQMVn4w/KTpI= =CGLu -----END PGP SIGNATURE-----
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