Date: Sun, 7 Nov 2010 17:40:22 -0800 From: Pyun YongHyeon <pyunyh@gmail.com> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: alc@freebsd.org, freebsd-current@freebsd.org Subject: Re: re(4) driver dropping packets when reading NFS files Message-ID: <20101108014022.GG1279@michelle.cdnetworks.com> In-Reply-To: <74999496.222044.1289178871881.JavaMail.root@erie.cs.uoguelph.ca> References: <20101108002601.GC1279@michelle.cdnetworks.com> <74999496.222044.1289178871881.JavaMail.root@erie.cs.uoguelph.ca>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, Nov 07, 2010 at 08:14:31PM -0500, Rick Macklem wrote:
> >
> > If that made difference, all other ethernet controllers would have
> > suffered from the similar issues.
> >
> Well, some commit done between June 7 and June 15 made a difference,
> but I have no idea what or why.
>
> Also, I had a report of very poor read rate from someone using a bge(4)
> interface, but I have no reason to believe it is because of the same
> issue.
>
> >
> > If you have some spare time please try attach one. I guess fast
> > ethernet controller has smaller FIFO size than that of GigE
> > controller so it is frequently triggered the issue on fast ethernet
> > controller than GigE controllers. I still guess that there are
> > cases that an interrupt is not correctly served such that driver
> > missed a lot of frames.
> >
> Patch didn't help. If anything it degrading things a bit (stats are
> attached).
>
By chance, how about disabling RX early interrupt?
You can add the following 3 lines of code into re_init_locked().
2710 /*
2711 * Set the initial RX configuration.
2712 */
2713 re_set_rxmode(sc);
2714
2715 /* Disable RX early interrupt. */
2716 cfg = CSR_READ_2(sc, RL_MULTIINTR);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2717 cfg &= 0xF000;
^^^^^^^^^^^^^^
2718 CSR_WRITE_2(sc, RL_MULTIINTR, cfg);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2719
2720 #ifdef DEVICE_POLLING
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20101108014022.GG1279>