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Michael S. Tsirkin 1daa8790d0 virtio_net: fix truesize for mergeable buffers 
Seth Forshee noticed a performance degradation with some workloads.
This turns out to be due to packet drops.  Euan Kemp noticed that this
is because we drop all packets where length exceeds the truesize, but
for some packets we add in extra memory without updating the truesize.
This in turn was kept around unchanged from ab7db91705 ("virtio-net:
auto-tune mergeable rx buffer size for improved performance").  That
commit had an internal reason not to account for the extra space: not
enough bits to do it.  No longer true so let's account for the allocated
length exactly.

Many thanks to Seth Forshee for the report and bisecting and Euan Kemp
for debugging the issue.

Fixes: 680557cf79 ("virtio_net: rework mergeable buffer handling")
Reported-by: Euan Kemp <euan.kemp@coreos.com>
Tested-by: Euan Kemp <euan.kemp@coreos.com>
Reported-by: Seth Forshee <seth.forshee@canonical.com>
Tested-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-31 18:02:46 -07:00
arch
block
certs
crypto
Documentation
drivers virtio_net: fix truesize for mergeable buffers 2017-07-31 18:02:46 -07:00
firmware
fs
include udp6: fix socket leak on early demux 2017-07-29 14:19:03 -07:00
init
ipc
kernel bpf: fix bpf_prog_get_info_by_fd to dump correct xlated_prog_len 2017-07-29 23:29:41 -07:00
lib lib: test_rhashtable: Fix KASAN warning 2017-07-25 12:35:23 -07:00
mm
net ipv4: fib: Fix NULL pointer deref during fib_sync_down_dev() 2017-07-31 17:51:11 -07:00
samples
scripts
security
sound
tools bpf: don't zero out the info struct in bpf_obj_get_info_by_fd() 2017-07-26 17:02:52 -07:00
usr
virt
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
CREDITS
Kbuild
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MAINTAINERS MAINTAINERS: Add more files to the PHY LIBRARY section 2017-07-31 17:52:47 -07:00
Makefile
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.