DPDK usage discussions
 help / color / mirror / Atom feed
* [dpdk-users] Does vmxnet3 PMD supports LSC=1 ?
@ 2021-01-14 17:30 madhukar mythri
  2021-01-14 18:50 ` Thomas Monjalon
  0 siblings, 1 reply; 4+ messages in thread
From: madhukar mythri @ 2021-01-14 17:30 UTC (permalink / raw)
  To: users

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.

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-01-15  6:09 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-14 17:30 [dpdk-users] Does vmxnet3 PMD supports LSC=1 ? madhukar mythri
2021-01-14 18:50 ` Thomas Monjalon
2021-01-14 18:58   ` Yong Wang
2021-01-15  6:09     ` madhukar mythri

DPDK usage discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/users/0 users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 users users/ https://inbox.dpdk.org/users \
		users@dpdk.org
	public-inbox-index users

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.users


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git