From: "Zhang, Qi Z" <qi.z.zhang@intel.com>
To: "Zhang, Xiao" <xiao.zhang@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
"Zhao1, Wei" <wei.zhao1@intel.com>,
"Zhang, Xiao" <xiao.zhang@intel.com>
Subject: Re: [dpdk-dev] [DPDK] net/e1000: fix buffer overrun while i219 processing DMA transactions
Date: Fri, 19 Jul 2019 05:44:22 +0000 [thread overview]
Message-ID: <039ED4275CED7440929022BC67E7061153D697BA@SHSMSX105.ccr.corp.intel.com> (raw)
In-Reply-To: <1562593002-36586-1-git-send-email-xiao.zhang@intel.com>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Xiao Zhang
> Sent: Monday, July 8, 2019 9:37 PM
> To: dev@dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Zhao1, Wei
> <wei.zhao1@intel.com>; Zhang, Xiao <xiao.zhang@intel.com>
> Subject: [dpdk-dev] [DPDK] net/e1000: fix buffer overrun while i219
> processing DMA transactions
>
> Intel® 100/200 Series Chipset platforms reduced the round-trip latency for the
> LAN Controller DMA accesses, causing in some high performance cases a buffer
> overrun while the I219 LAN Connected Device is processing the DMA
> transactions. I219LM and I219V devices can fall into unrecovered Tx hang
> under very stressfully UDP traffic and multiple reconnection of Ethernet cable.
> This Tx hang of the LAN Controller is only recovered if the system is rebooted.
> Slightly slow down DMA access by reducing the number of outstanding
> requests.
> This workaround could have an impact on TCP traffic performance on the
> platform. Disabling TSO eliminates performance loss for TCP traffic without a
> noticeable impact on CPU performance.
>
> Please, refer to I218/I219 specification update:
> https://www.intel.com/content/www/us/en/embedded/products/networking
> /
> ethernet-connection-i218-family-documentation.html
>
> Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
Applied to dpdk-next-net-intel.
Thanks
Qi
next prev parent reply other threads:[~2019-07-19 5:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 13:36 Xiao Zhang
2019-07-19 5:44 ` Zhang, Qi Z [this message]
2019-07-20 2:56 ` Anand H. Krishnan
2019-07-20 8:17 ` Zhang, Xiao
2019-07-20 17:01 ` [dpdk-dev] [v2] " Xiao Zhang
2019-07-22 0:43 ` Zhang, Qi Z
2019-07-26 2:52 ` [dpdk-dev] [DPDK] " Zhao1, Wei
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