From: Phil Sutter <phil.sutter@viprinet.com>
To: Ben Hutchings <bhutchings@solarflare.com>
Cc: linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
Russell King <linux@arm.linux.org.uk>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] af_packet: flush complete kernel cache in packet_sendmsg
Date: Fri, 2 Sep 2011 15:59:55 +0200 [thread overview]
Message-ID: <20110902135954.GA29025@philter> (raw)
In-Reply-To: <1314971179.3092.159.camel@deadeye>
On Fri, Sep 02, 2011 at 02:46:17PM +0100, Ben Hutchings wrote:
> On Fri, 2011-09-02 at 13:08 +0200, Phil Sutter wrote:
> > This flushes the cache before and after accessing the mmapped packet
> > buffer. It seems like the call to flush_dcache_page from inside
> > __packet_get_status is not enough on Kirkwood (or ARM in general).
> > ---
> > I know this is far from an optimal solution, but it's in fact the only working
> > one I found.
> [...]
>
> This is ridiculous. If flush_dcache_page() isn't doing everything it
> should, you need to fix that.
You're absolutely correct. But in fact this problem goes way too deep
for me to find it's cause. And since my time is finite, I doubt this
will change in the near future. So I asked for help, a pointer in
whatever direction or anything I could try to help further analyzing -
without any response (unless I missed it, in which case I apologize).
Please don't get me wrong. I have no intend in this patch becoming
mainline, just want to give others with the same problem a starting
point.
Greetings, Phil
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next prev parent reply other threads:[~2011-09-02 14:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-08 13:06 ARM, AF_PACKET: caching problems on Marvell Kirkwood Phil Sutter
2011-05-05 14:11 ` Phil Sutter
2011-05-05 14:56 ` Eric Dumazet
2011-05-06 16:12 ` Phil Sutter
2011-05-05 19:46 ` Andrew Lunn
2011-05-06 16:17 ` Phil Sutter
2011-05-09 8:59 ` Phil Sutter
2011-05-25 10:32 ` Phil Sutter
2011-09-02 11:08 ` [PATCH] af_packet: flush complete kernel cache in packet_sendmsg Phil Sutter
2011-09-02 13:46 ` Ben Hutchings
2011-09-02 13:59 ` Phil Sutter [this message]
2011-09-02 17:28 ` Russell King - ARM Linux
2011-09-05 19:57 ` Phil Sutter
2011-09-06 9:57 ` Russell King - ARM Linux
2011-09-06 11:05 ` Phil Sutter
[not found] ` <D3F292ADF945FB49B35E96C94C2061B90A239361@nsmail.netscout.com>
2011-09-02 14:00 ` FW: " chetan loke
2011-09-02 15:31 ` Phil Sutter
2011-09-02 16:49 ` chetan loke
2011-09-06 9:44 ` Phil Sutter
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