linux-kernel - Re: Problem: Out of memory after 2days with 2GB RAM

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Date:	Thu, 12 Jun 2008 20:50:44 +0300
From:	"Tomas Winkler" <tomasw@...il.com>
To:	"Johannes Berg" <johannes@...solutions.net>
Cc:	"Rik van Riel" <riel@...hat.com>,
	"Zdenek Kabelac" <zdenek.kabelac@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	yi.zhu@...el.com, reinette.chatre@...el.com,
	linux-wireless@...r.kernel.org
Subject: Re: Problem: Out of memory after 2days with 2GB RAM

On Thu, Jun 12, 2008 at 8:39 PM, Johannes Berg
<johannes@...solutions.net> wrote:
>
>> > Yeah, but why bother if we can just allocate 10% of the size, waste a
>> > lot less memory etc. mac80211 isn't going to pass in a scatter/gather
>> > frame anyway.
>>
>> Hope never dies. I actually have seen this speed up the throughput so
>> I will dig into it anyway.
>
> Well, you can always add it back later if you make the networking stack
> and mac80211 support it. It's a two-line patch after all.

I will handle this.

>> > The more interesting thing is the pci_alloc_consistent allocation right
>> > below that is also _huge_, but that's because of the stupid hardware
>> > design, or can the hardware cope with having the descriptors non-linear
>> > in memory?
>>
>> We talk after your next HW design. How will configure 265 * 16
>> descriptors separately.
>
> Well, considering that other hardware does manage to do things
> differently (say Broadcom because I know their DMA engine), I don't know
> why your hw designers went wild with this. All you need is an
> "end-of-frame" flag. But that's not really interesting to discuss,
> unless this is actually controlled by the microcode and you can change
> it.
>
This is have to do something with HW packet scheduling

> johannes
>
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