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Filename Latest commit message Latest commit date
Hayes Wang 1f103ca31c r8152: limit the RX buffer size of RTL8153A for USB 2.0 
[ Upstream commit f91a50d8b51b5c8ef1cfb08115a005bba4250507 ]

If the USB host controller is EHCI, the throughput is reduced from
300Mb/s to 60Mb/s, when the rx buffer size is modified from 16K to
32K.

According to the EHCI spec, the maximum size of the qTD is 20K.
Therefore, when the driver uses more than 20K buffer, the latency
time of EHCI would be increased. And, it let the RTL8153A get worse
throughput.

However, the driver uses alloc_pages() for rx buffer, so I limit
the rx buffer to 16K rather than 20K.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=205923
Fixes: ec5791c202 ("r8152: separate the rx buffer size")
Reported-by: Robert Davies <robdavies1977@gmail.com>
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-03-30 14:35:27 +02:00
arch ARM: dts: at91-sama5d27_som1: fix phy address to 7 2021-03-30 14:35:24 +02:00
block block: Suppress uevent for hidden device when removed 2021-03-30 14:35:23 +02:00
certs
crypto crypto: x86 - Regularize glue function prototypes 2021-03-20 10:39:47 +01:00
Documentation KVM: arm64: Reject VM creation when the default IPA size is unsupported 2021-03-17 17:03:57 +01:00
drivers r8152: limit the RX buffer size of RTL8153A for USB 2.0 2021-03-30 14:35:27 +02:00
fs squashfs: fix xattr id and id lookup sanity checks 2021-03-30 14:35:23 +02:00
include tcp: relookup sock for RST+ACK packets handled by obsolete req sock 2021-03-30 14:35:26 +02:00
init
ipc
kernel gcov: fix clang-11+ support 2021-03-30 14:35:23 +02:00
lib
LICENSES
mm hugetlbfs: hugetlb_fault_mutex_hash() cleanup 2021-03-30 14:35:19 +02:00
net mac80211: fix rate mask reset 2021-03-30 14:35:26 +02:00
samples
scripts
security integrity: double check iint_cache was initialized 2021-03-30 14:35:24 +02:00
sound ALSA: hda: ignore invalid NHLT table 2021-03-30 14:35:20 +02:00
tools libbpf: Use SOCK_CLOEXEC when opening the netlink socket 2021-03-30 14:35:27 +02:00
usr
virt KVM: arm64: Ensure I-cache isolation between vcpus of a same VM 2021-03-17 17:03:57 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
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Makefile Linux 5.4.108 2021-03-24 11:26:46 +01:00
README

README 

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.