Date: Tue, 13 Feb 2001 18:36:07 -0800 (PST) From: Luigi Rizzo <rizzo@aciri.org> To: kjc@csl.sony.co.jp (Kenjiro Cho) Cc: rizzo@aciri.org, net@freebsd.org Subject: Re: fxp performance ? Message-ID: <200102140236.f1E2aCU57546@iguana.aciri.org> In-Reply-To: <20010214112310G.kjc@csl.sony.co.jp> from Kenjiro Cho at "Feb 14, 2001 11:23:10 am"
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> > Unfortunately my diagnostic tools do not let me see what is going
> > on on the wire, whether the spacing is larger than it should be,
actually i managed to instrument the driver and the spacing
between interrupts (with a change similar to the one you
proposed -- i make them occur every N packets ) is approx (N*9)us
which seems to suggest a larger spacing than it should be.
Wonder if the interframe spacing or the preamble lenght is
incorrect...
cheers
luigi
>
> It might be related to the fact that the fxp driver doesn't generate
> a transmission complete interrupt unless the interface queue length is
> exactly 119.
>
> Does the following change make any difference?
>
> --- if_fxp.c- Wed Feb 14 11:13:42 2001
> +++ if_fxp.c Wed Feb 14 11:14:27 2001
> @@ -1183,6 +1183,7 @@
> * going again if suspended.
> */
> if (txp != NULL) {
> + txp->cb_command |= FXP_CB_COMMAND_I;
> fxp_scb_wait(sc);
> CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_RESUME);
> }
>
> -Kenjiro
>
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