From: "Venkatesan, Venky" <venky.venkatesan@intel.com>
To: Zoltan Kiss <zoltan.kiss@linaro.org>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] ixgbe: fix checking for tx_free_thresh
Date: Thu, 28 May 2015 10:50:49 +0000 [thread overview]
Message-ID: <65CC0274-0B2A-460C-B381-59EB8CE9F970@intel.com> (raw)
In-Reply-To: <1432757539-8544-1-git-send-email-zoltan.kiss@linaro.org>
NAK. This causes more (unsuccessful) cleanup attempts on the descriptor ring. What is motivating this change?
Regards,
Venky
> On May 28, 2015, at 1:42 AM, Zoltan Kiss <zoltan.kiss@linaro.org> wrote:
>
> This check doesn't do what's required by rte_eth_tx_burst:
> "When the number of previously sent packets reached the "minimum transmit
> packets to free" threshold"
>
> This can cause problems when txq->tx_free_thresh + [number of elements in the
> pool] < txq->nb_tx_desc.
>
> Signed-off-by: Zoltan Kiss <zoltan.kiss@linaro.org>
> ---
> drivers/net/ixgbe/ixgbe_rxtx.c | 4 ++--
> drivers/net/ixgbe/ixgbe_rxtx_vec.c | 2 +-
> 2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
> index 4f9ab22..b70ed8c 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -250,10 +250,10 @@ tx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
>
> /*
> * Begin scanning the H/W ring for done descriptors when the
> - * number of available descriptors drops below tx_free_thresh. For
> + * number of in flight descriptors reaches tx_free_thresh. For
> * each done descriptor, free the associated buffer.
> */
> - if (txq->nb_tx_free < txq->tx_free_thresh)
> + if ((txq->nb_tx_desc - txq->nb_tx_free) > txq->tx_free_thresh)
> ixgbe_tx_free_bufs(txq);
>
> /* Only use descriptors that are available */
> diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec.c b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
> index abd10f6..f91c698 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx_vec.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
> @@ -598,7 +598,7 @@ ixgbe_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
> if (unlikely(nb_pkts > RTE_IXGBE_VPMD_TX_BURST))
> nb_pkts = RTE_IXGBE_VPMD_TX_BURST;
>
> - if (txq->nb_tx_free < txq->tx_free_thresh)
> + if ((txq->nb_tx_desc - txq->nb_tx_free) > txq->tx_free_thresh)
> ixgbe_tx_free_bufs(txq);
>
> nb_commit = nb_pkts = (uint16_t)RTE_MIN(txq->nb_tx_free, nb_pkts);
> --
> 1.9.1
>
next prev parent reply other threads:[~2015-05-28 10:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-27 20:12 Zoltan Kiss
2015-05-28 10:50 ` Venkatesan, Venky [this message]
2015-05-28 11:12 ` Zoltan Kiss
2015-06-01 16:15 ` Zoltan Kiss
2015-06-02 13:31 ` Ananyev, Konstantin
2015-06-02 15:08 ` Zoltan Kiss
2015-06-02 17:35 ` Ananyev, Konstantin
2015-06-03 17:46 ` Zoltan Kiss
2015-06-09 11:18 ` Ananyev, Konstantin
2015-06-09 15:08 ` Zoltan Kiss
2015-06-09 15:44 ` Ananyev, Konstantin
2015-06-09 17:46 ` Zoltan Kiss
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