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dcb95f06ea
In order to take the best from per-cpu NAPI skbuff_head caches and CPU cycles, let's switch from dev_kfree_skb_any(), which passes skb back to the mm layer, to napi_consume_skb(), which feeds those caches on non-zero budget instead (falls back to the former on 0). Do the replacement in e1000_unmap_and_free_tx_resource(). There are 4 call sites of this function throughout the driver: * e1000_clean_tx_ring(). Slowpath, process context, cleans the whole Tx ring on ifdown. Use budget of 0 here; * e1000_tx_map(). Hotpath, net Tx softirq, unmaps the buffers in case of error. Use 0 as well; * e1000_clean_tx_irq(). Hotpath, NAPI Tx completion polling cycle. As the driver doesn't count completed Tx entries towards the NAPI budget, just use the poll budget of 64 to utilize caches. Apart from being a preparation for switching to napi_build_skb(), this is useful on its own as well, as napi_consume_skb() flushes skb caches by batches of 32 instead of one-at-a-time. Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> Tested-by: Tony Brelinski <tony.brelinski@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
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.