Hi Kevin, 

Understood. If you manage to confirm things are stable on latest vpp, maybe try 
to backport patches that changed tls tx functions. Worst case, you’ll have to 
backport some session layer patches as well. 

Regards,
Florin

> On Mar 7, 2023, at 5:24 AM, Kevin Yan <kevin....@mavenir.com> wrote:
> 
> Hi Florin,
>                Due to some reasons we need to stay on vpp20.09 for some time, 
>  that’s why I hope I can fix the issue on this version. Actually, I  did some 
> code changes in TLS layer to let session node force reschedule the TLS 
> session when tx svm fifo is full or at least not empty, after the changes, 
> the tx  svm fifo can be recovered after stopping the traffic, but I think 
> this is not the correct way to solve the issue😊.
>  
>                Anyway let me see if I can test the same case with latest vpp 
> codes
>  
> BRs,
> Kevin
>  
> From: vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io 
> <mailto:vpp-dev@lists.fd.io>> On Behalf Of Florin Coras
> Sent: Tuesday, March 7, 2023 2:49 PM
> To: vpp-dev <vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>>
> Cc: Olivia Dunham <theoliviadun...@gmail.com 
> <mailto:theoliviadun...@gmail.com>>
> Subject: COMMERCIAL BULK: Re: [E] COMMERCIAL BULK: [vpp-dev] TLS app stuck 
> after burst of traffic #vpp-hoststack
>  
> Email is from a Free Mail Service (Gmail/Yahoo/Hotmail….) : Beware of 
> Phishing Scams, Report questionable emails tos...@mavenir.com 
> <mailto:s...@mavenir.com>
> Hi Kevin,  
>  
> That’s a really old version of vpp. TLS has seen several improvements since 
> then in areas including scheduling after incomplete writes. If you get a 
> chance to test vpp latest or a more recent release, do let us know if the 
> issue still persists. 
>  
> Regards,
> Florin
> 
> 
> On Mar 6, 2023, at 5:42 PM, Kevin Yan via lists.fd.io 
> <kevin.yan=mavenir....@lists.fd.io 
> <mailto:kevin.yan=mavenir....@lists.fd.io>> wrote:
>  
> Hi @Olivia Dunham <mailto:theoliviadun...@gmail.com>,
>                Recently I met the exact same issue,  TLS TX svm fifo gets 
> full after burst of traffic and it will never resume, meanwhile, TCP TX svm 
> fifo is empty at that time I’m using VPP20.09,  I believe there is some issue 
> in TLS layer,
> so did you fix the issue later? If yes, can you share the solution.
>  
> BRs,
> Kevin
>  
> From: vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io 
> <mailto:vpp-dev@lists.fd.io>> On Behalf Of Olivia Dunham
> Sent: Tuesday, September 14, 2021 8:58 PM
> To: vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>
> Subject: [E] COMMERCIAL BULK: [vpp-dev] TLS app stuck after burst of traffic 
> #vpp-hoststack
>  
> Email is from a Free Mail Service (Gmail/Yahoo/Hotmail….) : Beware of 
> Phishing Scams, Report questionable emails tos...@mavenir.com 
> <mailto:s...@mavenir.com>
> During sudden burst of traffic, the TCP fifo gets full. When this happens the 
> openssl TLS app de-schedules the transport. But once the TCP data is sent 
> out, the TLS is not resuming. VPP ends up in a state where TCP fifo is empty, 
> but the TLS fifo is full and no more Tx happens on TLS fifo.
> 
> VPP version: 21.01
> 
> We came across this commit - session tls: deq notifications for custom tx 
> <https://github.com/FDio/vpp/commit/1e6a0f64653c8142fa7032aba127ab4894bafc3c>
> Not sure what is the issue fixed by this commit, but It doesn't seem to fix 
> the above mentioned issue.
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