Re: [PATCH v2 0/4] Optimise 64-bit IOVA allocations
From: Leizhen (ThunderTown)
Date: Tue Aug 08 2017 - 21:49:15 EST
On 2017/8/8 20:03, Ganapatrao Kulkarni wrote:
> On Wed, Jul 26, 2017 at 4:47 PM, Leizhen (ThunderTown)
> <thunder.leizhen@xxxxxxxxxx> wrote:
>>
>>
>> On 2017/7/26 19:08, Joerg Roedel wrote:
>>> Hi Robin.
>>>
>>> On Fri, Jul 21, 2017 at 12:41:57PM +0100, Robin Murphy wrote:
>>>> Hi all,
>>>>
>>>> In the wake of the ARM SMMU optimisation efforts, it seems that certain
>>>> workloads (e.g. storage I/O with large scatterlists) probably remain quite
>>>> heavily influenced by IOVA allocation performance. Separately, Ard also
>>>> reported massive performance drops for a graphical desktop on AMD Seattle
>>>> when enabling SMMUs via IORT, which we traced to dma_32bit_pfn in the DMA
>>>> ops domain getting initialised differently for ACPI vs. DT, and exposing
>>>> the overhead of the rbtree slow path. Whilst we could go around trying to
>>>> close up all the little gaps that lead to hitting the slowest case, it
>>>> seems a much better idea to simply make said slowest case a lot less slow.
>>>
>>> Do you have some numbers here? How big was the impact before these
>>> patches and how is it with the patches?
>> Here are some numbers:
>>
>> (before)$ iperf -s
>> ------------------------------------------------------------
>> Server listening on TCP port 5001
>> TCP window size: 85.3 KByte (default)
>> ------------------------------------------------------------
>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35898
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0-10.2 sec 7.88 MBytes 6.48 Mbits/sec
>> [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35900
>> [ 5] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec
>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35902
>> [ 4] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec
>>
>> (after)$ iperf -s
>> ------------------------------------------------------------
>> Server listening on TCP port 5001
>> TCP window size: 85.3 KByte (default)
>> ------------------------------------------------------------
>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36330
>> [ ID] Interval Transfer Bandwidth
>> [ 4] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec
>> [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36332
>> [ 5] 0.0-10.0 sec 1.10 GBytes 939 Mbits/sec
>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36334
>> [ 4] 0.0-10.0 sec 1.10 GBytes 938 Mbits/sec
>>
>
> Is this testing done on Host or on Guest/VM?
Host
>
>>>
>>>
>>> Joerg
>>>
>>>
>>> .
>>>
>>
>> --
>> Thanks!
>> BestRegards
>>
>>
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>
> thanks
> Ganapat
>
> .
>
--
Thanks!
BestRegards