* Sending and receiving on the same port at the same time, from different threads
@ 2016-01-15 16:54 Zoltan Kiss
2016-01-15 17:33 ` Matthew Hall
0 siblings, 1 reply; 3+ messages in thread
From: Zoltan Kiss @ 2016-01-15 16:54 UTC (permalink / raw)
To: dev
Hi,
I've been asked this question, and I realized I'm not sure about the
answer. In other words: can you call rte_eth_tx_burst() and
rte_eth_tx_burst() on the same port at the same time from different
threads? In theory it seems possible, as you still access different
queues (an RX and a TX one), and at least taking a glance at ixgbe
vector functions, they don't seem to use common resources while doing RX
or TX. But I'm not sure that it's generally true, although I always
assumed that it should be true. Have anyone seen a device where it
wasn't true?
Regards,
Zoltan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Sending and receiving on the same port at the same time, from different threads
2016-01-15 16:54 Sending and receiving on the same port at the same time, from different threads Zoltan Kiss
@ 2016-01-15 17:33 ` Matthew Hall
2016-01-15 18:15 ` Stephen Hemminger
0 siblings, 1 reply; 3+ messages in thread
From: Matthew Hall @ 2016-01-15 17:33 UTC (permalink / raw)
To: Zoltan Kiss; +Cc: dev
On Fri, Jan 15, 2016 at 04:54:11PM +0000, Zoltan Kiss wrote:
> Can you call rte_eth_tx_burst() and rte_eth_tx_burst() on the same port at
> the same time from different threads?
In general, yes you can. I did this before in an L4-L7 performance tester, so
cores could concentrate on RX or TX to keep the speeds high.
> Have anyone seen a device where it wasn't true?
Not specifically. But I didn't go looking for one either.
Matthew.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Sending and receiving on the same port at the same time, from different threads
2016-01-15 17:33 ` Matthew Hall
@ 2016-01-15 18:15 ` Stephen Hemminger
0 siblings, 0 replies; 3+ messages in thread
From: Stephen Hemminger @ 2016-01-15 18:15 UTC (permalink / raw)
To: Matthew Hall; +Cc: dev
On Fri, 15 Jan 2016 12:33:14 -0500
Matthew Hall <mhall@mhcomputing.net> wrote:
> On Fri, Jan 15, 2016 at 04:54:11PM +0000, Zoltan Kiss wrote:
> > Can you call rte_eth_tx_burst() and rte_eth_tx_burst() on the same port at
> > the same time from different threads?
>
> In general, yes you can. I did this before in an L4-L7 performance tester, so
> cores could concentrate on RX or TX to keep the speeds high.
>
> > Have anyone seen a device where it wasn't true?
>
> Not specifically. But I didn't go looking for one either.
>
> Matthew.
Same port is OK, as long as each thread uses different queues.
The device queues are not thread safe; ie two threads can't be pulling/pushing
to the same queue.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2016-01-15 18:15 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2016-01-15 16:54 Sending and receiving on the same port at the same time, from different threads Zoltan Kiss
2016-01-15 17:33 ` Matthew Hall
2016-01-15 18:15 ` Stephen Hemminger
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