netdev - Re: [Bug #14016] mm/ipw2200 regression

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Date:	Thu, 27 Aug 2009 17:11:29 +0800
From:	Zhu Yi <yi.zhu@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, Johannes Weiner <hannes@...xchg.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Mel Gorman <mel@...net.ie>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	James Ketrenos <jketreno@...ux.intel.com>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw2100-devel@...ts.sourceforge.net" 
	<ipw2100-devel@...ts.sourceforge.net>
Subject: Re: [Bug #14016] mm/ipw2200 regression

On Wed, 2009-08-26 at 22:44 +0800, Andrew Morton wrote:
> 
> It is perhaps pretty simple to make the second (GFP_ATOMIC) allocation
> go away.  The code is already conveniently structured to do this:
> 
>         do {
>                 chunk = (struct fw_chunk *)(data + offset);
>                 offset += sizeof(struct fw_chunk);
>                 /* build DMA packet and queue up for sending */
>                 /* dma to chunk->address, the chunk->length bytes from
> data +
>                  * offeset*/
>                 /* Dma loading */
>                 rc = ipw_fw_dma_add_buffer(priv, shared_phys + offset,
> 
> le32_to_cpu(chunk->address),
> 
> le32_to_cpu(chunk->length));
>                 if (rc) {
>                         IPW_DEBUG_INFO("dmaAddBuffer Failed\n");
>                         goto out;
>                 }
> 
>                 offset += le32_to_cpu(chunk->length);
>         } while (offset < len);
> 
> what is the typical/expected value of chunk->length here?  If it's
> significantly less than 4096*(2^6), could we convert this function to
> use a separate DMAable allocation per fw_chunk?

Unfortunately, the largest chunk size for the latest 3.1 firmware is
0x20040, which also requires order 6 page allocation. I'll try to use
the firmware DMA command block (64 slots) to handle the image (each for
4k, totally 256k).

Thanks,
-yi

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