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646f071d31
Change VMBus channels macro (VRSS_CHANNEL_DEFAULT) in Linux netvsc from 8 to 16 to align with Azure Windows VM and improve networking throughput. For VMs having less than 16 vCPUS, the channels depend on number of vCPUs. For greater than 16 vCPUs, set the channels to maximum of VRSS_CHANNEL_DEFAULT and number of physical cores / 2 which is returned by netif_get_num_default_rss_queues() as a way to optimize CPU resource utilization and scale for high-end processors with many cores. Maximum number of channels are by default set to 64. Based on this change the channel creation would change as follows: ----------------------------------------------------------------- | No. of vCPU | dev_info->num_chn | channels created | ----------------------------------------------------------------- | 1-16 | 16 | vCPU | | >16 | max(16,#cores/2) | min(64 , max(16,#cores/2)) | ----------------------------------------------------------------- Performance tests showed significant improvement in throughput: - 0.54% for 16 vCPUs - 0.83% for 32 vCPUs - 0.86% for 48 vCPUs - 9.72% for 64 vCPUs - 13.57% for 96 vCPUs Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Shradha Gupta <shradhagupta@linux.microsoft.com> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Link: https://patch.msgid.link/1724735791-22815-1-git-send-email-ernis@linux.microsoft.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.