From mboxrd@z Thu Jan 1 00:00:00 1970 From: Larry Finger Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb Date: Sun, 17 May 2009 18:16:21 -0500 Message-ID: <4A109AC5.7040008@lwfinger.net> References: <_AjETDMbIoL.A.DcH.RYzDKB@chimera> <385Pu-agh7M.A.SU.iYzDKB@chimera> <20090516163610.8a012268.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=larry.finger-fOdFMYwuEsI@public.gmane.org; a=rsa-sha256; c=relaxed/relaxed; t=1242602207; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:References:Subject:CC:To:MIME-Version:From:Date: Message-ID; bh=yhVzud7IsfnPDwi0W8nYH3c7o00teAnAEkk4DKVXVuI=; b=BwL EOEz9tyHw1QNbNTspBT1PDKaZgfmFZsFLqK2l+026YO6/fdp+mXoR+V02BXbjG7A+16 8ofiS/cDXkggyLeg== In-Reply-To: <20090516163610.8a012268.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> Sender: linux-wireless-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Andrew Morton Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Johannes Berg , linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Andrew Morton wrote: > > Well.. order-1 GFP_ATOMIC allocations are unreliable. The networking > code should hanlde the situation and recover. I assume that is > happening in this case? Yes, the driver has recovered in all cases so far. > Perhaps we did something in that code after 2.6.29 which increased the > frequency of the order-1 allocation attempts? Maybe earlier kernels > used order-0 all the time? Those are much more reliable. I think something happened to change the allocation as I never saw these O(1) failures before with these particular drivers. I put in a few test printk's and the buffers were 700-800 bytes long, and I would not expect them to require more than an O(0) allocation. I pushed 2.6.30-rc6 hard for ~12 hours without any recurrence of the problem. Given the relative infrequency of the error, this certainly does not indicate a fix in recent code. I will be trying to force it again. Larry -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html