a992005cc8
Sukadev Bhattiprolu says: ==================== ibmvnic: Use a set of LTBs per pool ibmvnic uses a single large long term buffer (LTB) per rx or tx pool (queue). This has two limitations. First, if we need to free/allocate an LTB (eg during a reset), under low memory conditions, the allocation can fail. Second, the kernel limits the size of single LTB (DMA buffer) to 16MB (based on MAX_ORDER). With jumbo frames (mtu = 9000) we can only have about 1763 buffers per LTB (16MB / 9588 bytes per frame) even though the max supported buffers is 4096. (The 9588 instead of 9088 comes from IBMVNIC_BUFFER_HLEN.) To overcome these limitations, allow creating a set of LTBs per queue. ==================== Link: https://lore.kernel.org/r/20220413171026.1264294-1-drt@linux.ibm.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 Restructured Text 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.