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295525e29a
Currently, the virtio core will perform a dma operation for each
buffer. Although, the same page may be operated multiple times.
This patch, the driver does the dma operation and manages the dma
address based the feature premapped of virtio core.
This way, we can perform only one dma operation for the pages of the
alloc frag. This is beneficial for the iommu device.
kernel command line: intel_iommu=on iommu.passthrough=0
| strict=0 | strict=1
Before | 775496pps | 428614pps
After | 1109316pps | 742853pps
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Message-Id: <20230810123057.43407-13-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.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.