Rusty Russell a32a8813d0 lguest: improve interrupt handling, speed up stream networking
lguest never checked for pending interrupts when enabling interrupts, and
things still worked.  However, it makes a significant difference to TCP
performance, so it's time we fixed it by introducing a pending_irq flag
and checking it on irq_restore and irq_enable.

These two routines are now too big to patch into the 8/10 bytes
patch space, so we drop that code.

Note: The high latency on interrupt delivery had a very curious
effect: once everything else was optimized, networking without GSO was
faster than networking with GSO, since more interrupts were sent and
hence a greater chance of one getting through to the Guest!

Note2: (Almost) Closing the same loophole for iret doesn't have any
measurable effect, so I'm leaving that patch for the moment.

Before:
	1GB tcpblast Guest->Host:		30.7 seconds
	1GB tcpblast Guest->Host (no GSO):	76.0 seconds

After:
	1GB tcpblast Guest->Host:		6.8 seconds
	1GB tcpblast Guest->Host (no GSO):	27.8 seconds

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-06-12 22:27:03 +09:30
..
2009-04-08 11:51:46 -07:00
2009-02-10 00:41:58 +01:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-04-28 17:42:08 +02:00
2009-01-29 14:16:51 +01:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2009-01-29 14:17:01 +01:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-04-07 13:36:36 +02:00
2008-10-22 22:55:23 -07:00
2009-02-10 00:42:00 +01:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-03-27 14:43:57 -04:00
2008-12-12 11:58:36 +01:00
2009-04-10 20:27:13 +02:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-01-21 17:26:06 +09:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-04-22 13:56:25 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-01-31 00:17:39 +05:30
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2009-05-18 09:21:04 +02:00
2008-10-22 22:55:20 -07:00
2009-02-05 22:30:14 +01:00
2008-10-22 22:55:23 -07:00
2009-02-13 13:23:02 +01:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-05-11 08:54:33 -07:00
2009-01-23 18:42:06 +01:00
2009-04-21 10:48:08 +02:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:20 -07:00
2009-02-02 23:27:09 +05:30
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2009-04-01 08:59:16 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2009-01-31 00:19:32 +05:30
2008-10-22 22:55:23 -07:00
2009-03-27 14:43:57 -04:00
2008-10-22 22:55:23 -07:00
2009-03-02 12:07:49 +01:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-06-11 08:50:59 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2009-01-25 16:57:47 +01:00
2008-10-22 22:55:23 -07:00
2008-11-09 21:05:43 +01:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-12-14 16:24:38 -08:00
2009-06-10 12:27:08 +03:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:23 -07:00
2008-10-22 22:55:20 -07:00