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From: Nithin Dabilpuram <nithind1988@gmail.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: David Marchand <david.marchand@redhat.com>,
	David Christensen <drc@linux.vnet.ibm.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	dev <dev@dpdk.org>, dpdk stable <stable@dpdk.org>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v8 1/3] vfio: revert changes for map contiguous areas in one go
Date: Fri, 5 Mar 2021 21:20:16 +0530
Message-ID: <YEJTABQu9lLe2tZ3@gmail.com> (raw)
In-Reply-To: <d8bf297d-6347-f065-d507-4468a30d35ca@intel.com>

On Fri, Mar 05, 2021 at 01:54:34PM +0000, Burakov, Anatoly wrote:
> On 05-Mar-21 7:50 AM, David Marchand wrote:
> > On Fri, Jan 15, 2021 at 8:33 AM Nithin Dabilpuram
> > <ndabilpuram@marvell.com> wrote:
> > > 
> > > In order to save DMA entries limited by kernel both for externel
> > > memory and hugepage memory, an attempt was made to map physically
> > > contiguous memory in one go. This cannot be done as VFIO IOMMU type1
> > > does not support partially unmapping a previously mapped memory
> > > region while Heap can request for multi page mapping and
> > > partial unmapping.
> > > Hence for going back to old method of mapping/unmapping at
> > > memseg granularity, this commit reverts
> > > commit d1c7c0cdf7ba ("vfio: map contiguous areas in one go")
> > > 
> > > Also add documentation on what module parameter needs to be used
> > > to increase the per-container dma map limit for VFIO.
> > > 
> > > Fixes: d1c7c0cdf7ba ("vfio: map contiguous areas in one go")
> > > Cc: anatoly.burakov@intel.com
> > > Cc: stable@dpdk.org
> > > 
> > > Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> > > Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
> > > Acked-by: David Christensen <drc@linux.vnet.ibm.com>
> > 
> > There is a regression reported in bz: https://bugs.dpdk.org/show_bug.cgi?id=649
> > 
> > I assigned it to Anatoly for now.
> > Nithin, can you have a loo too?
> > 
> > Thanks.
> > 
> > 
> 
> I've responded on the bug tracker as well, but to repeat it here: this is
> not a regression, this is intended behavior. We cannot do anything about
> this.

To add, for test case to pass, either limits have to be increased, or use "--mp-alloc=xmemhuge" 
instead of "--mp-alloc=xmem" which is forcing system page size or reduce total mbuf count
to reduce page count.

> 
> -- 
> Thanks,
> Anatoly

  reply	other threads:[~2021-03-05 15:50 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20201012081106.10610-1-ndabilpuram@marvell.com>
2020-10-12  8:11 ` [dpdk-stable] [PATCH 2/2] vfio: fix partial DMA unmapping for VFIO type1 Nithin Dabilpuram
2020-10-14 15:07   ` Burakov, Anatoly
2020-10-15  6:09     ` [dpdk-stable] [EXT] " Nithin Dabilpuram
2020-10-15 10:00       ` Burakov, Anatoly
2020-10-15 11:38         ` Nithin Dabilpuram
2020-10-15 11:50         ` Nithin Dabilpuram
2020-10-15 11:57         ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
2020-10-15 15:10           ` Burakov, Anatoly
2020-10-16  7:10             ` Nithin Dabilpuram
2020-10-17 16:14               ` Burakov, Anatoly
2020-10-19  9:43                 ` Nithin Dabilpuram
2020-10-22 12:13                   ` Nithin Dabilpuram
2020-10-28 13:04                     ` Burakov, Anatoly
2020-10-28 14:17                       ` Nithin Dabilpuram
2020-10-28 16:07                         ` Burakov, Anatoly
2020-10-28 16:31                           ` Nithin Dabilpuram
     [not found] ` <20201105090423.11954-1-ndabilpuram@marvell.com>
2020-11-05  9:04   ` [dpdk-stable] [PATCH v2 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-11-05  9:04   ` [dpdk-stable] [PATCH v2 2/3] vfio: fix DMA mapping granularity for type1 iova as va Nithin Dabilpuram
2020-11-10 14:04     ` Burakov, Anatoly
2020-11-10 14:22       ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
2020-11-10 14:17     ` [dpdk-stable] " Burakov, Anatoly
2020-11-11  5:08       ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
2020-11-11 10:00         ` Burakov, Anatoly
     [not found] ` <20201201193302.28131-1-ndabilpuram@marvell.com>
2020-12-01 19:32   ` [dpdk-stable] [PATCH v3 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-01 19:33   ` [dpdk-stable] [PATCH v3 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20201202054647.3449-1-ndabilpuram@marvell.com>
2020-12-02  5:46   ` [dpdk-stable] [PATCH v4 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-02 18:36     ` David Christensen
2020-12-02  5:46   ` [dpdk-stable] [PATCH v4 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
2020-12-02 18:38     ` David Christensen
     [not found] ` <20201214081935.23577-1-ndabilpuram@marvell.com>
2020-12-14  8:19   ` [dpdk-stable] [PATCH v5 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-14  8:19   ` [dpdk-stable] [PATCH v5 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20201217190604.29803-1-ndabilpuram@marvell.com>
2020-12-17 19:06   ` [dpdk-stable] [PATCH v6 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-17 19:06   ` [dpdk-stable] [PATCH v6 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20210112173923.30320-1-ndabilpuram@marvell.com>
2021-01-12 17:39   ` [dpdk-stable] [PATCH v7 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2021-01-12 17:39   ` [dpdk-stable] [PATCH v7 2/3] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20210115073243.7025-1-ndabilpuram@marvell.com>
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2021-03-05  7:50     ` David Marchand
2021-03-05 13:54       ` Burakov, Anatoly
2021-03-05 15:50         ` Nithin Dabilpuram [this message]
2021-04-01 11:27           ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 2/3] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 3/3] test: change external memory test to use system page sz Nithin Dabilpuram
2021-02-11 11:21     ` Burakov, Anatoly

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