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Michael Ellerman b53744612f [PATCH] powerpc: Make rtas console _much_ faster 
Currently the hvc_rtas driver is painfully slow to use. Our "benchmark" is
ls -R /etc, which spits out about 27866 characters. The theoretical maximum
speed would be about 2.2 seconds, the current code takes ~50 seconds.

The core of the problem is that sometimes when the tty layer asks us to push
characters the firmware isn't able to handle some or all of them, and so
returns an error. The current code sees this and just returns to the tty code
with the buffer half sent.

The khvcd thread will eventually wake up and try to push more characters, which
will usually work because by then the firmware's had time to make room. But
the khvcd thread only wakes up every 10 milliseconds, which isn't fast enough.

So change the khvcd thread logic so that if there's an incomplete write we
yield() and then immediately try writing again. Doing so makes POLL_QUICK and
POLL_WRITE synonymous, so remove POLL_QUICK.

With this patch our "benchmark" takes ~2.8 seconds.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
History 2006-06-09 21:24:18 +10:00
..
acorn [PATCH] move capable() to capability.h 2006-01-11 18:42:13 -08:00
acpi [PATCH] x86_64: Support memory hotadd without sparsemem 2006-04-09 11:53:16 -07:00
amba [ARM] Remove asm/irq.h includes from ARM drivers 2006-01-09 13:56:42 +00:00
atm [PATCH] Replace 0xff.. with correct DMA_xBIT_MASK 2006-03-28 09:16:07 -08:00
base [PATCH] revert "swsusp add check for suspension of X controlled devices" 2006-05-31 16:27:11 -07:00
block Merge ../linux-2.6 2006-05-19 15:02:42 +10:00
bluetooth [PATCH] pcmcia: use bitfield instead of p_state and state 2006-03-31 17:26:33 +02:00
cdrom [PATCH] powerpc: update iSeries viocd and viotape device-tree 2006-05-19 14:35:31 +10:00
char [PATCH] powerpc: Make rtas console _much_ faster 2006-06-09 21:24:18 +10:00
connector [PATCH] sem2mutex: drivers: raw, connector, dcdbas, ppp_generic 2006-03-23 07:38:10 -08:00
cpufreq [PATCH] x86_64: Move ondemand timer into own work queue 2006-05-08 09:34:56 -07:00
crypto [CRYPTO] api: Align tfm context as wide as possible 2006-03-21 20:14:08 +11:00
dio [PATCH] hp300: fix driver_register() return handling, remove dio_module_init() 2006-03-25 08:22:53 -08:00
edac [PATCH] EDAC Coexistence with BIOS 2006-05-03 20:05:41 -07:00
eisa [PATCH] EISA: Ignore generated file drivers/eisa/devlist.h 2006-03-25 08:23:01 -08:00
fc4 [PATCH] drivers/fc4/fc.c: memset correct length 2006-02-20 20:00:11 -08:00
firmware [PATCH] DMI: move dmi_scan.c from arch/i386 to drivers/firmware/ 2006-04-14 11:41:25 -07:00
hwmon [PATCH] w83792d: Be quiet on misdetection 2006-04-14 11:18:33 -07:00
i2c [PATCH] scx200_acb: fix section mismatch warning 2006-05-26 11:55:46 -07:00
ide [PATCH] sgiioc4: use mmio ops instead of port io 2006-05-31 16:27:11 -07:00
ieee1394 [PATCH] ohci1394, sbp2: fix "scsi_add_device failed" with PL-3507 based devices 2006-05-17 21:32:22 -07:00
infiniband IB/mthca: Fix posting lists of 256 receive requests to SRQ for Tavor 2006-05-24 13:43:37 -07:00
input Input: psmouse - DMI updates for lifebook protocol 2006-05-29 23:31:12 -04:00
isdn [PATCH] Overrun in isdn_tty.c 2006-05-21 12:59:18 -07:00
leds [PATCH] LED: Fix sysfs store function error handling 2006-05-15 11:20:56 -07:00
macintosh [PATCH] powerpc: fix oops in alsa powermac driver 2006-04-21 22:34:26 +10:00
mca [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
md [PATCH] md: Fix badness in sysfs_notify caused by md_new_event 2006-05-31 16:27:11 -07:00
media [PATCH] V4L/DVB (4045): Fixes recursive dependency for I2C 2006-05-24 18:48:28 -07:00
message [SCSI] mptfc: race between mptfc_register_dev and mptfc_target_alloc 2006-05-10 09:54:42 -05:00
mfd [PATCH] show MCP menu only on ARCH_SA1100 2006-03-24 07:33:28 -08:00
misc [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
mmc [MMC] Fix premature use of md->disk 2006-05-24 08:35:31 -07:00
mtd [PATCH] Remove blkmtd 2006-04-11 06:18:43 -07:00
net Merge branch 'merge' 2006-06-01 19:05:23 +10:00
nubus Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
oprofile [PATCH] mark f_ops const in the inode 2006-03-28 09:16:05 -08:00
parisc [PARISC] Document that we tolerate "Relaxed Ordering" 2006-04-21 22:20:33 +00:00
parport [PATCH] parport_pc: fix section mismatch warnings (v2) 2006-04-19 09:13:52 -07:00
pci [PATCH] pci: correctly allocate return buffers for osc calls 2006-05-21 12:59:18 -07:00
pcmcia [PATCH] pd6729 section fix 2006-05-21 12:59:22 -07:00
pnp [PATCH] pnp: fix two messages in manager.c 2006-04-19 09:13:52 -07:00
rapidio [PATCH] Add rio_bus_type probe and remove methods 2006-01-13 11:26:10 -08:00
rtc [PATCH] rtc subsystem: use ENOIOCTLCMD and ENOTTY where appropriate 2006-05-21 12:59:21 -07:00
s390 [netdrvr s/390] trim trailing whitespace 2006-05-26 21:58:38 -04:00
sbus [SPARC]: Fix warning on prom_getproperty in openprom.c 2006-05-12 12:53:59 -07:00
scsi [PATCH] the latest consensus libata resume fix 2006-05-28 16:32:08 -04:00
serial [PATCH] ppc32 CPM_UART: various fixes for pq2 uart users 2006-05-26 22:38:56 +10:00
sh [PATCH] Add superhyway_bus_type probe and remove methods 2006-01-13 11:26:09 -08:00
sn [PATCH] Altix: correct ioc4 port order 2006-05-03 20:05:41 -07:00
spi [PATCH] s3c24xx: fix spi driver with CONFIG_PM 2006-05-26 11:55:46 -07:00
tc [PATCH] kill _INLINE_ 2006-03-23 07:38:16 -08:00
telephony [PATCH] pcmcia: use bitfield instead of p_state and state 2006-03-31 17:26:33 +02:00
usb [PATCH] HID read busywait fix 2006-05-21 12:59:17 -07:00
video [PATCH] maxinefb: Fix compilation error 2006-05-31 16:27:11 -07:00
w1 fix typos "wich" -> "which" 2006-03-24 18:23:14 +01:00
zorro [PATCH] amiga: fix driver_register() return handling, remove zorro_module_init() 2006-03-25 08:22:53 -08:00
Kconfig [IA64] IOC4 config option ordering 2006-04-21 10:59:00 -07:00
Makefile Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband 2006-04-02 12:51:22 -07:00