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Re: [lwip-users] Fw: (no subject)
From: |
Kieran Mansley |
Subject: |
Re: [lwip-users] Fw: (no subject) |
Date: |
Thu, 29 Sep 2011 19:43:11 +0100 |
On 29 Sep 2011, at 13:21, Anirudha Sarangi wrote:
>
> I went through the "tcp_write" code and compared it with older "tcp_write".
> There is a huge change in implementation.
> Then I changed my application so that when I call tcp_write, I pass the 4th
> argument (COPY) as zero. So I am telling the stack to use the same buffer and
> do not copy it to local buffer. With it my performance improved many folds.
> Just to give you an idea, with my change it is around 128 Mbps and without
> this, it was 86. So the new tcp_write interface is designed in such a way
> that if I ask it not to copy, then it behaves great.
I would expect the zero-copy version to perform much better than the copy
version, as you have seen.
> Same thing does not apply for lwip130. For lwip130, if I pass the 4th
> argument to tcp_write as 0, the improvement is not that big, may be in the
> range of 4-5 Mbps.
>
> Bottomline, lwip140 gives much better performance on Rx side. On Tx side,
> with zero copy it gives great performance. On the Tx side, without zero copy,
> its performance is worse than lwip130.
but I would also hope that 1.4.0 would perform as well if not better without
zero-copy.
I think your packet captures have been held waiting for me to approve them as
the attachments are so large. Perhaps you could get a smaller capture? Or
upload them somewhere we can access them. I don't really like forwarding many
megabytes to everyone on the mailing list.
Being able to compare the 1.4.0 behaviour to the 1.3.0 behaviour would probably
help too.
Kieran
- Re: [lwip-users] Fw: (no subject), (continued)
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/28
- Re: [lwip-users] Fw: (no subject), Kieran Mansley, 2011/09/28
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/28
- Re: [lwip-users] Fw: (no subject), Kieran Mansley, 2011/09/28
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/29
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/29
- Re: [lwip-users] Fw: (no subject), FreeRTOS Info, 2011/09/29
- Re: [lwip-users] Fw: (no subject), address@hidden, 2011/09/29
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/29
- Re: [lwip-users] Fw: (no subject), Anirudha Sarangi, 2011/09/29
- Re: [lwip-users] Fw: (no subject),
Kieran Mansley <=
- Re: [lwip-users] Fw: (no subject), address@hidden, 2011/09/29