[dpdk-dev] ixgbe vPMD question

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* [dpdk-dev] ixgbe vPMD question
@ 2015-09-17 20:28 Zoltan Kiss
  2015-09-18 16:20 ` Bruce Richardson
  0 siblings, 1 reply; 2+ messages in thread
From: Zoltan Kiss @ 2015-09-17 20:28 UTC (permalink / raw)
  To: dev, konstantin.ananyev, Richardson, Bruce

Hi,

The recv function does a prefetch on cacheline1, however it seems to me 
that rx_pkts[pos] should be uninitialized pointer at that time:

http://dpdk.org/browse/dpdk/tree/drivers/net/ixgbe/ixgbe_rxtx_vec.c#n287

So I guess it prefetches only random value. Or am I missing something?

Regards,

Zoltan

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [dpdk-dev] ixgbe vPMD question
  2015-09-17 20:28 [dpdk-dev] ixgbe vPMD question Zoltan Kiss
@ 2015-09-18 16:20 ` Bruce Richardson
  0 siblings, 0 replies; 2+ messages in thread
From: Bruce Richardson @ 2015-09-18 16:20 UTC (permalink / raw)
  To: Zoltan Kiss; +Cc: dev

On Thu, Sep 17, 2015 at 09:28:31PM +0100, Zoltan Kiss wrote:
> Hi,
> 
> The recv function does a prefetch on cacheline1, however it seems to me that
> rx_pkts[pos] should be uninitialized pointer at that time:
> 
> http://dpdk.org/browse/dpdk/tree/drivers/net/ixgbe/ixgbe_rxtx_vec.c#n287
> 
> So I guess it prefetches only random value. Or am I missing something?
> 
> Regards,
> 
> Zoltan

>From a look at the code, you may indeed by right here. We'll see about fixing
that up in a future patch.

/Bruce

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2015-09-17 20:28 [dpdk-dev] ixgbe vPMD question Zoltan Kiss
2015-09-18 16:20 ` Bruce Richardson

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