linux/include
Stefano Garzarella 473c7391ce vsock/virtio: limit the memory used per-socket
Since virtio-vsock was introduced, the buffers filled by the host
and pushed to the guest using the vring, are directly queued in
a per-socket list. These buffers are preallocated by the guest
with a fixed size (4 KB).

The maximum amount of memory used by each socket should be
controlled by the credit mechanism.
The default credit available per-socket is 256 KB, but if we use
only 1 byte per packet, the guest can queue up to 262144 of 4 KB
buffers, using up to 1 GB of memory per-socket. In addition, the
guest will continue to fill the vring with new 4 KB free buffers
to avoid starvation of other sockets.

This patch mitigates this issue copying the payload of small
packets (< 128 bytes) into the buffer of last packet queued, in
order to avoid wasting memory.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-07-30 15:00:00 -07:00
..
acpi It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
asm-generic Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2019-07-17 13:13:41 -07:00
clocksource
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-07-08 20:57:08 -07:00
drm drm fixes for -rc1: 2019-07-19 12:29:43 -07:00
dt-bindings ARM: Device-tree updates 2019-07-19 17:19:24 -07:00
keys request_key improvements 2019-07-08 19:19:37 -07:00
kvm
linux vsock/virtio: limit the memory used per-socket 2019-07-30 15:00:00 -07:00
math-emu
media media updates for v5.3-rc1 2019-07-09 09:47:22 -07:00
misc powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
net net: sched: include mpls actions in hardware intermediate representation 2019-07-23 13:52:50 -07:00
pcmcia It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
ras
rdma RDMA/core: Make rdma_counter.h compile stand alone 2019-07-09 09:44:47 -03:00
scsi SCSI fixes on 20190720 2019-07-20 10:04:58 -07:00
soc ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
sound ALSA: hda - Don't resume forcibly i915 HDMI/DP codec 2019-07-16 22:46:13 +02:00
target
trace NFS client updates for Linux 5.3 2019-07-18 14:32:33 -07:00
uapi media updates for v5.3-rc1 2019-07-22 09:01:47 -07:00
vdso
video drm main pull request for v5.3-rc1 (sans mm changes) 2019-07-15 19:04:27 -07:00
xen xen: remove tmem driver 2019-07-17 08:09:58 +02:00
Kbuild kbuild: add net/netfilter/nf_tables_offload.h to header-test blacklist. 2019-07-21 11:43:43 -07:00