Paolo Abeni db688c24ea vhost_net: use packet weight for rx handler, too ... Similar to commit a2ac99905f ("vhost-net: set packet weight of tx polling to 2 * vq size"), we need a packet-based limit for handler_rx, too - elsewhere, under rx flood with small packets, tx can be delayed for a very long time, even without busypolling. The pkt limit applied to handle_rx must be the same applied by handle_tx, or we will get unfair scheduling between rx and tx. Tying such limit to the queue length makes it less effective for large queue length values and can introduce large process scheduler latencies, so a constant valued is used - likewise the existing bytes limit. The selected limit has been validated with PVP[1] performance test with different queue sizes: queue size 256 512 1024 baseline 366 354 362 weight 128 715 723 670 weight 256 740 745 733 weight 512 600 460 583 weight 1024 423 427 418 A packet weight of 256 gives peek performances in under all the tested scenarios. No measurable regression in unidirectional performance tests has been detected. [1] https://developers.redhat.com/blog/2017/06/05/measuring-and-comparing-open-vswitch-performance/ Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2018-04-24 10:02:13 -04:00
..
Kconfig	tap: tap as an independent module	2017-02-11 20:59:41 -05:00
Kconfig.vringh	vhost: split out vringh Kconfig	2016-08-02 16:54:28 +03:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
net.c	vhost_net: use packet weight for rx handler, too	2018-04-24 10:02:13 -04:00
scsi.c	vhost: remove unused lock check flag in vhost_dev_cleanup()	2018-02-01 16:26:44 +02:00
test.c	vhost: remove unused lock check flag in vhost_dev_cleanup()	2018-02-01 16:26:44 +02:00
test.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
vhost.c	vhost: return bool from *_access_ok() functions	2018-04-11 10:54:06 -04:00
vhost.h	vhost: return bool from *_access_ok() functions	2018-04-11 10:54:06 -04:00
vringh.c	vringh: kill off ACCESS_ONCE()	2016-12-16 00:13:36 +02:00
vsock.c	fw_cfg, vhost: features fixes	2018-04-06 19:21:41 -07:00