From: Takashi Oe <toe@unlserve.unl.edu>
To: Benjamin Herrenschmidt <bh40@calva.net>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: [Fwd: Bug: 2.2.12 still hangs PPC after some PPP activity]
Date: Wed, 29 Sep 1999 19:46:03 -0500 (CDT) [thread overview]
Message-ID: <Pine.LNX.3.96LJ1.1b7.990929192816.20530A-100000@ofey.inetnebr.com> (raw)
In-Reply-To: <19990929111338.022344@mailhost.mipsys.com>
On Wed, 29 Sep 1999, Benjamin Herrenschmidt wrote:
> This doesn't look like the only problem. For example, in rs_close, we
> call tty_wait_until_sent with interrupt disabled. Can't this cause a
> deadlock ? There may be other cases like this.
>
> I'll look into adding some fixes and include them in the next kernel I
> post on my page (along with a few other stuffs I'd want to get tested,
> including your page_alloc() fix which _apparently_ increased the overall
> perfs on my machine but I didn't do real benchmarks). But I'm wondering
The __get_free_pages() fix is probably not needed for 2.2.13pre, although
something similar might save a few hundred cycles. Anyway, much to my
amazement, there is significant differences in a number of errors ppp link
report between the kernels with and without the __get_free_pages() patch.
With a stock 2.2.12 kernel, ppp link used to report 1 to 10% frame errors.
But, now, it hardly ever reports any error. Besides, my machine hasn't
crashed for two days. I can't remember the last time that my machine
stayed up so long.
> if we shouldn't include your DMA driver right now and make sure it works
> fine instead of doing yet another bunch of patches to the current
> macserial. I didn't try the DMA driver yet, are there known problems with it ?
I don't know of any major flaw, but the DMA code can use some testings.
I've only tested it on Power Mac 7600 with baud rate of upto 115200 bps.
Takashi Oe
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-09-30 0:46 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <37F1AD4B.585E99AB@chpc.utah.edu>
1999-09-29 7:11 ` [Fwd: Bug: 2.2.12 still hangs PPC after some PPP activity] Geert Uytterhoeven
1999-09-29 7:16 ` Takashi Oe
1999-09-29 7:40 ` Geert Uytterhoeven
1999-09-29 9:13 ` Benjamin Herrenschmidt
1999-09-30 0:46 ` Takashi Oe [this message]
1999-09-30 8:50 ` Benjamin Herrenschmidt
1999-09-30 16:21 ` Takashi Oe
1999-09-30 16:35 ` Benjamin Herrenschmidt
1999-10-06 5:33 ` update on macserial/DMA Takashi Oe
1999-10-06 8:35 ` Benjamin Herrenschmidt
1999-10-06 13:47 ` Takashi Oe
1999-10-06 16:25 ` Benjamin Herrenschmidt
1999-10-06 16:50 ` Benjamin Herrenschmidt
1999-10-08 7:13 ` Lou Langholtz
1999-10-09 17:57 ` Lou Langholtz
[not found] ` <Pine.LNX.3.96LJ1.1b7.991005234830.1210A-100000@ofey.inetne br.com>
1999-10-07 9:48 ` Franz Sirl
1999-10-07 15:37 ` phandel
1999-10-12 7:20 ` [Fwd: Bug: 2.2.12 still hangs PPC after some PPP activity] Lou Langholtz
1999-09-29 16:44 ` Lou Langholtz
1999-09-29 17:02 ` Benjamin Herrenschmidt
1999-09-29 18:08 ` Lou Langholtz
1999-09-29 18:46 ` Lou Langholtz
1999-09-29 20:00 ` Lou Langholtz
1999-09-30 1:14 ` Takashi Oe
1999-09-30 5:33 ` Geert Uytterhoeven
1999-10-01 13:26 ` Franz Sirl
1999-10-01 13:46 ` Alvin Brattli
[not found] ` <Pine.OSF.3.96.991001153658.16772E-100000@mitra.phys.uit.no >
1999-10-01 14:08 ` Franz Sirl
1999-10-01 16:14 ` Lou Langholtz
[not found] <37F1C0A3.B9F25580@chpc.utah.edu>
1999-09-29 7:39 ` Geert Uytterhoeven
1999-09-10 16:51 Lou Langholtz
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