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Current Striding RQ HW feature utilizes the RX buffers so that there is no wasted room between the strides. This maximises the memory utilization. This prevents the use of build_skb() (which requires headroom and tailroom), and demands to memcpy the packets headers into the skb linear part. In this patch, whenever a set of conditions holds, we apply an RQ configuration that allows combining the use of linear SKB on top of a Striding RQ. To use build_skb() with Striding RQ, the following must hold: 1. packet does not cross a page boundary. 2. there is enough headroom and tailroom surrounding the packet. We can satisfy 1 and 2 by configuring: stride size = MTU + headroom + tailoom. This is possible only when: a. (MTU - headroom - tailoom) does not exceed PAGE_SIZE. b. HW LRO is turned off. Using linear SKB has many advantages: - Saves a memcpy of the headers. - No page-boundary checks in datapath. - No filler CQEs. - Significantly smaller CQ. - SKB data continuously resides in linear part, and not split to small amount (linear part) and large amount (fragment). This saves datapath cycles in driver and improves utilization of SKB fragments in GRO. - The fragments of a resulting GRO SKB follow the IP forwarding assumption of equal-size fragments. Some implementation details: HW writes the packets to the beginning of a stride, i.e. does not keep headroom. To overcome this we make sure we can extend backwards and use the last bytes of stride i-1. Extra care is needed for stride 0 as it has no preceding stride. We make sure headroom bytes are available by shifting the buffer pointer passed to HW by headroom bytes. This configuration now becomes default, whenever capable. Of course, this implies turning LRO off. Performance testing: ConnectX-5, single core, single RX ring, default MTU. UDP packet rate, early drop in TC layer: -------------------------------------------- | pkt size | before | after | ratio | -------------------------------------------- | 1500byte | 4.65 Mpps | 5.96 Mpps | 1.28x | | 500byte | 5.23 Mpps | 5.97 Mpps | 1.14x | | 64byte | 5.94 Mpps | 5.96 Mpps | 1.00x | -------------------------------------------- TCP streams: ~20% gain Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.