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From: Thomas Monjalon <thomas@monjalon.net>
To: madhukar mythri <madhukar.mythri@gmail.com>
Cc: users@dpdk.org, Yong Wang <yongwang@vmware.com>
Subject: Re: [dpdk-users] Does vmxnet3 PMD supports LSC=1 ?
Date: Thu, 14 Jan 2021 19:50:40 +0100
Message-ID: <9703725.R88ScZ5S0C@thomas> (raw)
In-Reply-To: <CAAUNki0AJ2zzsmjCDoc7WH-6O+71JTKaR5-uJrzHUHX-tHE11w@mail.gmail.com>

+Cc Yong Wang, maintainer of this PMD.

14/01/2021 18:30, madhukar mythri:
> Hi,
> 
> Does vmxnet3 PMD support LSC=1(i.e with interrupt mode) for link changes ?
> 
> When i enable LSC=1 the functionality works fine, but, when pumping traffic
> i'm seeing increasing in CPU load on some cores which is running
> "eal-intr-thread" epoll_wait() function for more CPU-time.
> 
> Actually, interrupt should come only when Link changes, but, we are seeing
> interrupt for each incoming Rx-packet and also a lot of spurious interrupts.
> =============
> ~ # cat /proc/interrupts |grep igb
>  58:    1254293          0          0          0   PCI-MSI 1572864-edge
>  igb_uio
>  59:    1278105          0          0          0   PCI-MSI 5767168-edge
>  igb_uio
> ~ # cat /proc/irq/58/spurious
> count 98035
> unhandled 0
> last_unhandled 0 ms
> ~ #
> ==============
> 
> Does anyone tried LSC=1 in vmxnet3 PMD based apps and faced similar issues
> ? If so, please let me know.
> 
> Tried with DPDK-18.11, DPDK-19.11 and DPDK-20.05.
> 
> Thanks,
> Madhukar.



  reply	other threads:[~2021-01-14 18:50 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 17:30 madhukar mythri
2021-01-14 18:50 ` Thomas Monjalon [this message]
2021-01-14 18:58   ` Yong Wang
2021-01-15  6:09     ` madhukar mythri

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