linux-kernel - Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check

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Message-ID: <20100128223447.GC3109@del.dom.local>
Date:	Thu, 28 Jan 2010 23:34:47 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Michael Breuer <mbreuer@...jas.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	flyboy@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>,
	Don Fry <pcnet32@...izon.net>,
	Francois Romieu <romieu@...zoreil.com>,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at
 lib/dma-debug.c:902 check_sync)

On Thu, Jan 28, 2010 at 01:46:17PM -0500, Michael Breuer wrote:
> On 1/28/2010 12:08 PM, Stephen Hemminger wrote:
> >--- a/lib/dma-debug.c	2010-01-20 15:22:55.919519883 -0800
> >+++ b/lib/dma-debug.c	2010-01-20 15:26:31.648895638 -0800
> >@@ -285,11 +285,9 @@ static struct dma_debug_entry *hash_buck
> >  	}
> >
> >  	/*
> >-	 * If we have multiple matches but no perfect-fit, just return
> >-	 * NULL.
> >+	 * If we have multiple matches but no perfect-fit
> >+	 * return best value and let caller deal with it.
> >  	 */
> >-	ret = (matches == 1) ? ret : NULL;
> >-
> >  	return ret;
> >  }
> >
> Ok - applied. Noise gone... however I'm not sure whether I'll be
> able to keep dma-debug going long enough to catch anything.
> num_free_entries keeps dropping... looks like entries are not freed.
> I'm running with a huge number for now & sky2 as the driver filter.
> Is there a reason that entries wouldn't be unmapped, or is
> dma-debug.c just not processing the unmap correctly?

Do you mean it's after this patch or earlier too? I think you might
use my sky2/receive_copy/pci_unmap_len patch instead to get rid of
this warning.

Btw, since 1000 was too much, maybe you could try copybreak=256 yet,
plus additional ping or some other source of shorter packets. And how
about trying this new switch?

Jarek P.
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