netdev - Re: [PATCH net-next v3 1/3] selftests/ptr_ring: add benchmark application for ptr

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Date:   Fri, 2 Jul 2021 17:54:42 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <brouer@...hat.com>,
        <paulmck@...nel.org>, <peterz@...radead.org>, <will@...nel.org>,
        <shuah@...nel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linuxarm@...neuler.org>
Subject: Re: [PATCH net-next v3 1/3] selftests/ptr_ring: add benchmark
 application for ptr_ring

On 2021/7/2 17:04, Jason Wang wrote:
> 

[...]

> 
> 
>> I understand that you guys like to see a working testcase of virtio.
>> I would love to do that if I have the time and knowledge of virtio,
>> But I do not think I have the time and I am familiar enough with
>> virtio to fix that now.
> 
> 
> So ringtest is used for bench-marking the ring performance for different format. Virtio is only one of the supported ring format, ptr ring is another. Wrappers were used to reuse the same test logic.
> 
> Though you may see host/guest in the test, it's in fact done via two processes.
> 
> We need figure out:
> 
> 1) why the current ringtest.c does not fit for your requirement (it has SPSC test)

There is MPSC case used by pfifo_fast, it make more sense to use a separate selftest
for ptr_ring as ptr_ring has been used by various subsystems.


> 2) why can't we tweak the ptr_ring.c to be used by both ring_test and your benchmark

Actually that is what I do in this patch, move the specific part related to ptr_ring
to ptr_ring_test.h. When the virtio testing is refactored to work, it can reuse the
abstract layer in ptr_ring_test.h too.

> 
> If neither of the above work, we can invent new ptr_ring infrastructure under tests/
> 
> Thanks
> 
> 
>>
>>
> 
> .
>