From owner-freebsd-hardware  Fri Jul 21 16:30:48 2000
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Date: Fri, 21 Jul 2000 16:30:44 -0700 (PDT)
From: Jin Guojun (DSD staff) <jin@george.lbl.gov>
Message-Id: <200007212330.e6LNUiH06944@portnoy.lbl.gov>
To: ken@kdm.org
Subject: Re: SysKonnect and Intel gig boards
Cc: freebsd-hardware@FreeBSD.ORG, jhartley@netrail.net,
	mjacob@feral.com
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I will install a current host and test it sometime next week.

Thanks,

	-Jin

> On Mon, Jul 10, 2000 at 18:30:11 -0600, Kenneth D. Merry wrote:
> > On Mon, Jul 10, 2000 at 16:56:16 -0700, Jin Guojun wrote:
> > >     (2) chewing significant CPU: (tested on completely idle machines)
> > >             500 MHz P-III + single NetGear A620 I/O
> > >     takes 47% CPU time
> > > 
> > >             750 MHz AMD K7 + single NetGear A620 I/O
> > >     takes less 10% CPU
> > > 
> > >             500 MHz P-III + single SysKonnect I/O
> > >     takes less 5% CPU
> > 
> > What benchmark are you running and what size packets are you using?
> > 
> > I think I mentioned to you before that the driver is probably tuned for
> > 9000 byte packets, and you might need to tweak things somewhat to get
> > better performance with 1500 byte packets.
> 
> Another parameter to try is enabling transmit flow control.
> 
> The attached patch should do it for the -current driver, I think.
> 
> I haven't really tested this to see what effect it has, and it'll only work
> with Tigon II boards.  (The Netgear board is a Tigon II board.)
> 
> Ken
> -- 
> Kenneth Merry
> ken@kdm.org
> 
> --0OAP2g/MAC+5xKAE
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: attachment; filename="if_ti.c.flow_control.20000721"
> 
> ==== //depot/FreeBSD-current/src/sys/pci/if_ti.c#27 - /a/ken/perforce/FreeBSD-cu
> rrent/src/sys/pci/if_ti.c ====
> *** /tmp/tmp.61653.0    Fri Jul 21 16:50:09 2000
> --- /a/ken/perforce/FreeBSD-current/src/sys/pci/if_ti.c Fri Jul 21 16:49:57 2000
> ***************
> *** 2320,2327 ****
> --- 2320,2329 ----
>         case IFM_AUTO:
>                 CSR_WRITE_4(sc, TI_GCR_GLINK, TI_GLNK_PREF|TI_GLNK_1000MB|
>                     TI_GLNK_FULL_DUPLEX|TI_GLNK_RX_FLOWCTL_Y|
> +                   TI_GLNK_TX_FLOWCTL_Y|
>                     TI_GLNK_AUTONEGENB|TI_GLNK_ENB);
>                 CSR_WRITE_4(sc, TI_GCR_LINK, TI_LNK_100MB|TI_LNK_10MB|
> +                   TI_LNK_TX_FLOWCTL_Y|TI_LNK_RX_FLOWCTL_Y|
>                     TI_LNK_FULL_DUPLEX|TI_LNK_HALF_DUPLEX|
>                     TI_LNK_AUTONEGENB|TI_LNK_ENB);
>                 TI_DO_CMD(TI_CMD_LINK_NEGOTIATION,
> 
> --0OAP2g/MAC+5xKAE--


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