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Rusty Russell 44653eae14 virtio: don't always force a notification when ring is full 
We force notification when the ring is full, even if the host has
indicated it doesn't want to know.  This seemed like a good idea at
the time: if we fill the transmit ring, we should tell the host
immediately.

Unfortunately this logic also applies to the receiving ring, which is
refilled constantly.  We should introduce real notification thesholds
to replace this logic.  Meanwhile, removing the logic altogether breaks
the heuristics which KVM uses, so we use a hack: only notify if there are
outgoing parts of the new buffer.

Here are the number of exits with lguest's crappy network implementation:
Before:
	network xmit 7859051 recv 236420
After:
	network xmit 7858610 recv 118136

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-07-25 12:06:04 +10:00
..
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acpi Merge branch 'release-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6 2008-07-24 13:57:37 -07:00
amba
ata Merge commit 'origin/master' 2008-07-16 11:07:59 +10:00
atm atm: [fore200e] use MODULE_FIRMWARE() and other suggested cleanups 2008-07-23 20:29:21 -07:00
auxdisplay auxdisplay: small cleanups 2008-07-24 10:47:41 -07:00
base memory-hotplug: add sysfs removable attribute for hotplug memory remove 2008-07-24 10:47:21 -07:00
block device create: block: convert device_create to device_create_drvdata 2008-07-21 21:54:41 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-20 17:43:29 -07:00
cdrom cdrom: revert commit 22a9189 (cdrom: use kmalloced buffers instead of buffers on stack) 2008-07-04 09:52:14 +02:00
char drivers/char: remove old broken Cobalt LCD driver 2008-07-24 10:47:40 -07:00
clocksource Fix printk format warning in clocksource/acpi_pm.c 2008-07-15 11:01:39 -07:00
connector CONNECTOR: add a proc entry to list connectors 2008-06-27 20:03:24 -07:00
cpufreq Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
cpuidle sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
crypto crypto: ixp4xx - Select CRYPTO_AUTHENC 2008-07-13 20:12:11 +08:00
dca Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2008-07-23 12:03:18 -07:00
dio dio: use dio_match_device() in dio_bus_match() 2008-07-20 17:24:40 -07:00
dma I/OAT: I/OAT version 3.0 support 2008-07-22 17:30:57 -07:00
edac powerpc/cell/edac: Log a syndrome code in case of correctable error 2008-07-22 10:39:36 +10:00
eisa driver core: remove DEVICE_NAME_SIZE define 2008-07-21 21:54:53 -07:00
firewire Merge branch 'sbp2-spindown' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2008-07-15 12:39:44 -07:00
firmware cpumask: Replace cpumask_of_cpu with cpumask_of_cpu_ptr 2008-07-18 22:02:57 +02:00
gpio gpio: pcf857x: add lock and handle more chips 2008-07-22 09:59:41 -07:00
gpu drm/radeon: fixup issue with radeon and PAT support. 2008-07-15 15:48:05 +10:00
hid Merge branches 'upstream' and 'upstream-fixes' into for-linus 2008-07-23 15:26:10 +02:00
hwmon device create: hwmon: convert device_create to device_create_drvdata 2008-07-21 21:54:42 -07:00
i2c Driver Core: add ability for class_for_each_device to start in middle of list 2008-07-21 21:54:47 -07:00
ide ide: use proper printk() KERN_* levels in ide-probe.c 2008-07-24 22:53:36 +02:00
ieee1394 PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2008-07-24 12:56:07 -07:00
input Add missing semaphore.h includes 2008-07-24 08:30:48 -04:00
isdn gigaset: gigaset_isowbuf_getbytes() may return signed unnoticed 2008-07-24 10:47:22 -07:00
leds leds: Ensure led->trigger is set earlier 2008-07-23 09:49:56 +01:00
lguest Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
macintosh device create: macintosh: convert device_create to device_create_drvdata 2008-07-21 21:54:43 -07:00
mca driver core: remove DEVICE_NAME_SIZE define 2008-07-21 21:54:53 -07:00
md Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 2008-07-21 10:30:10 -07:00
media PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
memstick driver core: remove DEVICE_ID_SIZE define 2008-07-21 21:54:53 -07:00
message I2O: handle sysfs_create_link() failures 2008-07-24 10:47:30 -07:00
mfd Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-23 18:24:08 -07:00
misc Merge branch 'release-2.6.27' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6 2008-07-24 13:57:37 -07:00
mmc sdhci: highmem capable PIO routines 2008-07-23 14:42:09 +02:00
mtd PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
net virtio: Recycle unused recv buffer pages for large skbs in net driver 2008-07-25 12:06:02 +10:00
nubus
of OpenFirmware: Include <linux/of_i2c.h> from of_i2c.c. 2008-07-12 12:10:52 -06:00
oprofile
parisc parisc-eisa_eeprom: BKL pushdown 2008-07-02 15:06:24 -06:00
parport
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-24 13:57:13 -07:00
pcmcia PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
pnp PNPACPI: add support for HP vendor-specific CCSR descriptors 2008-07-16 23:27:07 +02:00
power Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-23 18:24:08 -07:00
ps3
rapidio rapidio: fix device reference counting 2008-07-10 18:04:43 -07:00
rtc rtc-vr41xx: add irq_set_freq() and irq_set_state() 2008-07-24 10:47:34 -07:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-22 19:09:51 -07:00
sbus sparc64: fix up bus_id changes in sparc core code 2008-07-21 21:55:03 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2008-07-24 14:55:09 -07:00
serial cpm1: don't send break on TX_STOP, don't interrupt RX/TX when adjusting termios parameters 2008-07-24 10:47:30 -07:00
sh
sn
spi spi: au1550_spi: improve pio transfer mode 2008-07-24 10:47:30 -07:00
ssb Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-08 16:30:17 -07:00
tc
telephony phonedev: cdev lock_kernel() pushdown 2008-06-20 14:05:48 -06:00
thermal thermal: Create CONFIG_THERMAL_HWMON=n 2008-06-25 19:25:42 -04:00
uio UIO: add generic UIO platform driver 2008-07-21 21:54:55 -07:00
usb Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-23 18:24:08 -07:00
video Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight 2008-07-24 12:16:40 -07:00
virtio virtio: don't always force a notification when ring is full 2008-07-25 12:06:04 +10:00
w1 w1/ds2482: Convert to a new-style driver 2008-07-16 19:30:07 +02:00
watchdog remove the v850 port 2008-07-24 10:47:24 -07:00
xen sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
zorro move memory_read_from_buffer() from fs.h to string.h 2008-07-24 10:47:13 -07:00
Kconfig
Makefile gpu: re-order GPU subdirectory vs char for AGP vs DRM startup. 2008-07-21 08:42:49 +10:00