Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932173AbbBJJqS (ORCPT ); Tue, 10 Feb 2015 04:46:18 -0500 Received: from smtp.citrix.com ([66.165.176.89]:13367 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752429AbbBJJqP (ORCPT ); Tue, 10 Feb 2015 04:46:15 -0500 X-IronPort-AV: E=Sophos;i="5.09,549,1418083200"; d="scan'208";a="224314350" Message-ID: <54D9D363.5060904@citrix.com> Date: Tue, 10 Feb 2015 09:46:11 +0000 From: David Vrabel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.4.0 MIME-Version: 1.0 To: "Wang, Xiaoming" , Konrad Rzeszutek Wilk CC: "linux-mips@linux-mips.org" , "pebolle@tiscali.nl" , "Zhang, Dongxing" , "lauraa@codeaurora.org" , "d.kasatkin@samsung.com" , "heiko.carstens@de.ibm.com" , "linux-kernel@vger.kernel.org" , "ralf@linux-mips.org" , "chris@chris-wilson.co.uk" , "takahiro.akashi@linaro.org" , "david.vrabel@citrix.com" , "linux@horizon.com" , "xen-devel@lists.xenproject.org" , "boris.ostrovsky@oracle.com" , "Liu, Chuansheng" , "akpm@linux-foundation.org" Subject: Re: [Xen-devel] [PATCH] modify the IO_TLB_SEGSIZE to io_tlb_segsize configurable as flexible requirement about SW-IOMMU. References: <1423177274-22118-1-git-send-email-xiaoming.wang@intel.com> <20150205193241.GC11646@x230.dumpdata.com> In-Reply-To: Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1563 Lines: 37 On 06/02/15 00:10, Wang, Xiaoming wrote: > > >> -----Original Message----- >> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com] >> Sent: Friday, February 6, 2015 3:33 AM >> To: Wang, Xiaoming >> Cc: ralf@linux-mips.org; boris.ostrovsky@oracle.com; >> david.vrabel@citrix.com; linux-mips@linux-mips.org; linux- >> kernel@vger.kernel.org; xen-devel@lists.xenproject.org; akpm@linux- >> foundation.org; linux@horizon.com; lauraa@codeaurora.org; >> heiko.carstens@de.ibm.com; d.kasatkin@samsung.com; >> takahiro.akashi@linaro.org; chris@chris-wilson.co.uk; pebolle@tiscali.nl; Liu, >> Chuansheng; Zhang, Dongxing >> Subject: Re: [PATCH] modify the IO_TLB_SEGSIZE to io_tlb_segsize >> configurable as flexible requirement about SW-IOMMU. >> >> On Fri, Feb 06, 2015 at 07:01:14AM +0800, xiaomin1 wrote: >>> The maximum of SW-IOMMU is limited to 2^11*128 = 256K. >>> While in different platform and different requirements this seems improper. >>> So modify the IO_TLB_SEGSIZE to io_tlb_segsize as configurable is make >> sense. >> >> More details please. What is the issue you are hitting? >> > Example: > If 1M bytes are requied. There has an error like. Instead of allowing the bouncing of such large buffers, could the gadget driver be modified to submit the buffers to the hardware in smaller chunks? David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/