DPDK usage discussions
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* [dpdk-users] General Questions
@ 2020-04-09  6:11 Cristofer Martins
  2020-04-09 14:58 ` Stephen Hemminger
  2020-04-09 15:27 ` Shyam Shrivastav
  0 siblings, 2 replies; 5+ messages in thread
From: Cristofer Martins @ 2020-04-09  6:11 UTC (permalink / raw)
  To: users

Well the reason i thought about using dpdk(together with a user space tcp stack) is because my tcp code spend so much time with syscalls that removing that would allow better throughput and latency. Is this a valid reason? My software runs in single core(and most of time in cheap vps) so i want to extract the best i can from them.
The other question is, can dpdk runs alongside with the linux network stack? I want to use dpdk in my special app but i still want to have ssh and apps working as expected without any modification.

Thanks in advance.


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [dpdk-users] General Questions
  2020-04-09  6:11 [dpdk-users] General Questions Cristofer Martins
@ 2020-04-09 14:58 ` Stephen Hemminger
  2020-04-09 15:27 ` Shyam Shrivastav
  1 sibling, 0 replies; 5+ messages in thread
From: Stephen Hemminger @ 2020-04-09 14:58 UTC (permalink / raw)
  To: Cristofer Martins; +Cc: users

On Thu, 9 Apr 2020 06:11:28 +0000
Cristofer Martins <CristoferMartins@hotmail.com> wrote:

> Well the reason i thought about using dpdk(together with a user space tcp stack) is because my tcp code spend so much time with syscalls that removing that would allow better throughput and latency. Is this a valid reason? My software runs in single core(and most of time in cheap vps) so i want to extract the best i can from them.
> The other question is, can dpdk runs alongside with the linux network stack? I want to use dpdk in my special app but i still want to have ssh and apps working as expected without any modification.
> 
> Thanks in advance.
> 

If you are doing syscalls in your DPDK application, then you are defeating the point
of DPDK and you are better off using the kernel networking stack.

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [dpdk-users] General Questions
  2020-04-09  6:11 [dpdk-users] General Questions Cristofer Martins
  2020-04-09 14:58 ` Stephen Hemminger
@ 2020-04-09 15:27 ` Shyam Shrivastav
  2020-04-09 15:32   ` Stephen Hemminger
  1 sibling, 1 reply; 5+ messages in thread
From: Shyam Shrivastav @ 2020-04-09 15:27 UTC (permalink / raw)
  To: Cristofer Martins; +Cc: users

From my experience as dpdk user

On Thu, Apr 9, 2020 at 11:41 AM Cristofer Martins <
CristoferMartins@hotmail.com> wrote:

> Well the reason i thought about using dpdk(together with a user space tcp
> stack) is because my tcp code spend so much time with syscalls that
> removing that would allow better throughput and latency. Is this a valid
> reason? My software runs in single core(and most of time in cheap vps) so i
> want to extract the best i can from them.
>

Yes using dpdk instead of getting packets from kernel stack increases
performance



> The other question is, can dpdk runs alongside with the linux network
> stack? I want to use dpdk in my special app but i still want to have ssh
> and apps working as expected without any modification.
>
Interface used by dpdk is not available, at least another interface
required for management/access &  other network apps



>
> Thanks in advance.
>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [dpdk-users] General Questions
  2020-04-09 15:27 ` Shyam Shrivastav
@ 2020-04-09 15:32   ` Stephen Hemminger
  2020-04-09 20:58     ` Thomas Monjalon
  0 siblings, 1 reply; 5+ messages in thread
From: Stephen Hemminger @ 2020-04-09 15:32 UTC (permalink / raw)
  To: Shyam Shrivastav; +Cc: Cristofer Martins, users

On Thu, 9 Apr 2020 20:57:19 +0530
Shyam Shrivastav <shrivastav.shyam@gmail.com> wrote:

> From my experience as dpdk user
> 
> On Thu, Apr 9, 2020 at 11:41 AM Cristofer Martins <
> CristoferMartins@hotmail.com> wrote:  
> 
> > Well the reason i thought about using dpdk(together with a user space tcp
> > stack) is because my tcp code spend so much time with syscalls that
> > removing that would allow better throughput and latency. Is this a valid
> > reason? My software runs in single core(and most of time in cheap vps) so i
> > want to extract the best i can from them.
> >  
> 
> Yes using dpdk instead of getting packets from kernel stack increases
> performance
> 
> 
> 
> > The other question is, can dpdk runs alongside with the linux network
> > stack? I want to use dpdk in my special app but i still want to have ssh
> > and apps working as expected without any modification.
> >  
> Interface used by dpdk is not available, at least another interface
> required for management/access &  other network apps
> 
> 
> 
> >
> > Thanks in advance.
> >  

This might be a good use case for AF_XDP with or without DPDK

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [dpdk-users] General Questions
  2020-04-09 15:32   ` Stephen Hemminger
@ 2020-04-09 20:58     ` Thomas Monjalon
  0 siblings, 0 replies; 5+ messages in thread
From: Thomas Monjalon @ 2020-04-09 20:58 UTC (permalink / raw)
  To: Shyam Shrivastav, Cristofer Martins; +Cc: users, Stephen Hemminger

09/04/2020 17:32, Stephen Hemminger:
> On Thu, 9 Apr 2020 20:57:19 +0530
> Shyam Shrivastav <shrivastav.shyam@gmail.com> wrote:
> 
> > From my experience as dpdk user
> > 
> > On Thu, Apr 9, 2020 at 11:41 AM Cristofer Martins <
> > CristoferMartins@hotmail.com> wrote:  
> > 
> > > Well the reason i thought about using dpdk(together with a user space tcp
> > > stack) is because my tcp code spend so much time with syscalls that
> > > removing that would allow better throughput and latency. Is this a valid
> > > reason? My software runs in single core(and most of time in cheap vps) so i
> > > want to extract the best i can from them.
> > >  
> > 
> > Yes using dpdk instead of getting packets from kernel stack increases
> > performance
> > 
> > 
> > 
> > > The other question is, can dpdk runs alongside with the linux network
> > > stack? I want to use dpdk in my special app but i still want to have ssh
> > > and apps working as expected without any modification.
> > >  
> > Interface used by dpdk is not available, at least another interface
> > required for management/access &  other network apps
> > 
> > 
> > 
> > >
> > > Thanks in advance.
> > >  
> 
> This might be a good use case for AF_XDP with or without DPDK

AF_XDP helps to use a device both with Linux stack and userland application.
This capability is what we call the bifurcated model.
The Mellanox drivers are also using a bifurcated model:
the same device can send some packet flows to the kernel interface,
and other (configured) packet flows to the DPDK interface.



^ permalink raw reply	[flat|nested] 5+ messages in thread

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2020-04-09  6:11 [dpdk-users] General Questions Cristofer Martins
2020-04-09 14:58 ` Stephen Hemminger
2020-04-09 15:27 ` Shyam Shrivastav
2020-04-09 15:32   ` Stephen Hemminger
2020-04-09 20:58     ` Thomas Monjalon

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