- 23 Jun, 2005 40 commits
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John Heffner authored
This patch implements Tom Kelly's Scalable TCP congestion control algorithm for the modular framework. The algorithm has some nice scaling properties, and has been used a fair bit in research, though is known to have significant fairness issues, so it's not really suitable for general purpose use. Signed-off-by:
John Heffner <jheffner@psc.edu> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Baruch Even authored
H-TCP is a congestion control algorithm developed at the Hamilton Institute, by Douglas Leith and Robert Shorten. It is extending the standard Reno algorithm with mode switching is thus a relatively simple modification. H-TCP is defined in a layered manner as it is still a research platform. The basic form includes the modification of beta according to the ratio of maxRTT to min RTT and the alpha=2*factor*(1-beta) relation, where factor is dependant on the time since last congestion. The other layers improve convergence by adding appropriate factors to alpha. The following patch implements the H-TCP algorithm in it's basic form. Signed-Off-By:
Baruch Even <baruch@ev-en.org> Signed-off-by:
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Stephen Hemminger authored
TCP Vegas code modified for the new TCP infrastructure. Vegas now uses microsecond resolution timestamps for better estimation of performance over higher speed links. Signed-off-by:
Stephen Hemminger <shemminger@osdl.org> Signed-off-by:
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Daniele Lacamera authored
TCP Hybla congestion avoidance. - "In heterogeneous networks, TCP connections that incorporate a terrestrial or satellite radio link are greatly disadvantaged with respect to entirely wired connections, because of their longer round trip times (RTTs). To cope with this problem, a new TCP proposal, the TCP Hybla, is presented and discussed in the paper[1]. It stems from an analytical evaluation of the congestion window dynamics in the TCP standard versions (Tahoe, Reno, NewReno), which suggests the necessary modifications to remove the performance dependence on RTT.[...]"[1] [1]: Carlo Caini, Rosario Firrincieli, "TCP Hybla: a TCP enhancement for heterogeneous networks", International Journal of Satellite Communications and Networking Volume 22, Issue 5 , Pages 547 - 566. September 2004. Signed-off-by: Daniele Lacamera (root at danielinux.net)net Signed-off-by:
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John Heffner authored
Sally Floyd's high speed TCP congestion control. This is useful for comparison and research. Signed-off-by:
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Stephen Hemminger authored
This is the existing 2.6.12 Westwood code moved from tcp_input to the new congestion framework. A lot of the inline functions have been eliminated to try and make it clearer. Signed-off-by:
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Stephen Hemminger authored
TCP BIC congestion control reworked to use the new congestion control infrastructure. This version is more up to date than the BIC code in 2.6.12; it incorporates enhancements from BICTCP 1.1, to handle low latency links. Signed-off-by:
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Stephen Hemminger authored
Update the documentation to remove the old sysctl values and include the new congestion control infrastructure. Includes changes to tcp.txt by Ian McDonald. Signed-off-by:
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Stephen Hemminger authored
Enhancement to the tcp_diag interface used by the iproute2 ss command to report the tcp congestion control being used by a socket. Signed-off-by:
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Stephen Hemminger authored
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Stephen Hemminger authored
Allow TCP to have multiple pluggable congestion control algorithms. Algorithms are defined by a set of operations and can be built in or modules. The legacy "new RENO" algorithm is used as a starting point and fallback. Signed-off-by:
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Russell King authored
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Adrian Bunk authored
This makes the USB_MON less confusing. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Telemaque Ndizihiwe authored
Clean up tortured logic in sys_open(). Signed-off-by:
Telemaque Ndizihiwe <telendiz@eircom.net> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
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Alexey Dobriyan authored
tty_register_ldisc(N_FOO, NULL) => tty_unregister_ldisc(N_FOO) Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Alexey Dobriyan authored
It's a bit strange to see tty_register_ldisc call in modules' exit functions. Signed-off-by:
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Andrew Morton authored
drivers/usb/media/pwc/pwc-uncompress.c: In function `pwc_decompress': drivers/usb/media/pwc/pwc-uncompress.c:140: warning: unreachable code at beginning of switch statement Signed-off-by:
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Eric Piel authored
The current ide-cd driver reports the CDROM speed (as found in /proc/sys/dev/cdrom/info) as the current speed when loading the driver. Changing the speed of the cdrom drive (by "eject -x" for instance) doesn't update the speed reported by the kernel. Updating the info could be valuable for the user as it's the only way to know if the drive accepted the request or discarded it. It could even be used to list all the available speeds of the drive. The attached patch modifies the ide-cd driver so that after every speed change request the new speed is updated. Please note that the actual modification is very little but I had to touch quite a few lines in order to avoid to pre-declare the sub-functions. Signed-off-by:
Eric Piel <eric.piel@tremplin-utc.net> Acked-by:
Jens Axboe <axboe@suse.de> Signed-off-by:
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Jesper Juhl authored
Add note about the soon-to-come removal of verify_area() to Documentation/feature-removal-schedule.txt. Signed-off-by:
Jesper Juhl <juhl-lkml@dif.dk> Signed-off-by:
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Benjamin LaHaise authored
In the upcoming aio_down patch, it is useful to store a private data pointer in the kiocb's wait_queue. Since we provide our own wake up function and do not require the task_struct pointer, it makes sense to convert the task pointer into a generic private pointer. Signed-off-by:
Benjamin LaHaise <benjamin.c.lahaise@intel.com> Signed-off-by:
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Benjamin LaHaise authored
When do_sync_(read|write) encounters an aio method that makes use of the retry mechanism, they fail to correctly retry the operation. This fixes that by adding the appropriate sleep and retry mechanism. Signed-off-by:
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Andrew Morton authored
The driver plays with waitqueue internals and fails to compile after Ben's "aio: make wait_queue ->task ->private" patch. Signed-off-by:
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Anton Altaparmakov authored
fs/buffer.c::__block_prepare_write() has broken error recovery. It calls the get_block() callback with "create = 1" and if that succeeds it immediately clears buffer_new on the just allocated buffer (which has buffer_new set). The bug is that if an error occurs and get_block() returns != 0, we break from this loop and go into recovery code. This code has this comment: /* Error case: */ /* * Zero out any newly allocated blocks to avoid exposing stale * data. If BH_New is set, we know that the block was newly * allocated in the above loop. */ So the intent is obviously good in that it wants to clear just allocated and hence not zeroed buffers. However the code recognises allocated buffers by checking for buffer_new being set. Unfortunately __block_prepare_write() as discussed above already cleared buffer_new on all allocated buffers thus no buffers will be cleared during error recovery and old data will be leaked. The simplest way I can see to fix this is to make the current recovery code work by _not_ clearing buffer_new after calling get_block() in __block_prepare_write(). We cannot safely allow buffer_new buffers to "leak out" of __block_prepare_write(), thus we simply do a quick loop over the buffers clearing buffer_new on each of them if it is set just before returning "success" from __block_prepare_write(). Signed-off-by:
Anton Altaparmakov <aia21@cantab.net> Signed-off-by:
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Christoph Hellwig authored
This file duplicates <linux/posix_acl_xattr.h>, using slightly different names. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Christoph Hellwig authored
Signed-off-by:
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William Lee Irwin III authored
Kconfig is spitting out massive numbers of errors and so on. This patch switches arch/sparc/Kconfig to use drivers/Kconfig so those stop. Signed-off-by:
William Irwin <wli@holomorphy.com> Signed-off-by:
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Christoph Lameter authored
The following patch removes the f_error field and all checks of f_error. Trond said: f_error was introduced for NFS, and made sense when we were guaranteed always to have a file pointer around when write errors occurred. Since then, we have (for various reasons) had to introduce the nfs_open_context in order to track the file read/write state, and it made sense to move our f_error tracking there too. Signed-off-by:
Christoph Lameter <christoph@lameter.com> Acked-by:
Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by:
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Bjorn Helgaas authored
The HCDP specs (i.e., PCDP revision < 3) allow zero as a default value for baud rate and data bits. So if firmware doesn't supply them, let early_serial_console_init() probe for them rather than telling it the baud rate is zero. Also, update the URL for the PCDP spec. Signed-off-by:
Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by:
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Arnd Bergmann authored
This patch allows block device drivers to convert their ioctl functions to unlocked_ioctl() like character devices and other subsystems. All functions that were called with the BKL held before are still used that way, but I would not be surprised if it could be removed from the ioctl functions in drivers/block/ioctl.c themselves. As a side note, I found that compat_blkdev_ioctl() acquires the BKL as well, which looks like a bug. I have checked that every user of disk->fops->compat_ioctl() in the current git tree gets the BKL itself, so it could easily be removed from compat_blkdev_ioctl(). Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
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Stephen Rothwell authored
This patch is based on work by Carlos O'Donell and Matthew Wilcox. It introduces/updates the compat_time_t type and uses it for compat siginfo structures. I have built this on ppc64 and x86_64. Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Daniel Ritz authored
- make boot-up card recognition more reliable (ie. redo interrogation always if there is no valid 'card inserted' state) (and yes, i saw it happening on an o2micro controller that both CB_CBARD and CB_16BITCARD bits were set at the same time) - also redo interrogation before probing the ISA interrupts. it's safer to do the probing with the socket in a clean state. - make card insert detect more reliable. yenta_get_status() now returns SS_PENDING as long as the card is not completley inserted and one of the voltage bits is set. also !CB_CBARD doesn't mean CB_16BITCARD. there is CB_NOTACARD as well, so make an explicit check for CB_16BITCARD. - for TI bridges: disable IRQs during power-on. in all-serial and tied interrupt mode the interrupts are always disabled for single-slot controllers. for two-slot contollers the disabling is only done when the other slot is empty. to force disabling there is a new module parameter now: pwr_irqs_off=Y (which is a regression for working setups. that's why it's an option, only use when required) - modparm to disable ISA interrupt probing (isa_probe, defaults to on) - remove unneeded code/cleanups (ie. merge yenta_events() into yenta_interrupts()) Signed-off-by:
Daniel Ritz <daniel.ritz@gmx.ch> Signed-off-by:
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Michal Schmidt authored
include/asm/offset.h is a generated file on x86_64 and mips. Let's add it to Documentation/dontdiff. Signed-off-by:
Michal Schmidt <xschmi00@stud.feec.vutbr.cz> Signed-off-by:
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TINNES Julien RD-MAPS-ISS authored
A pointer is dereferenced before it is null-checked. Signed-off-by:
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Thierry Vignaud authored
gconfig: only show scrollbars if needed (which is more user friendly): Signed-off-by:
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Manfred Spraul authored
Patrick noticed that the initial scan of the semaphore operations logs decrease and increase operations seperately, but then both cases are or'ed together and decrease is never used. The attached patch removes the decrease parameter - it shrinks sys_semtimedop() by 56 bytes. Signed-Of-By:
Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Matthias Urlichs authored
Frame pointers are supposed to enable debuggers to reliably tell where a call comes from. That is defeated by GCC's sibling call optimization (aka tail recursion elimination). This patch turns this optimization off when compiling with frame pointers. Signed-Off-By:
Matthias Urlichs <smurf@smurf.noris.de> Signed-off-by:
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Christoph Lameter authored
Avoid taking the tasklist_lock in sys_times if the process is single threaded. In a NUMA system taking the tasklist_lock may cause a bouncing cacheline if multiple independent processes continually call sys_times to measure their performance. Signed-off-by:
Shai Fultheim <shai@scalex86.org> Signed-off-by:
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Pekka Enberg authored
This patch gets rid of some macro obfuscation from fs/eventpoll.c by removing slab allocator wrappers and converting macros to static inline functions. Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Acked-by:
Davide Libenzi <davidel@xmailserver.org> Signed-off-by:
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Peter Osterlund authored
This patch improves write performance for the CD/DVD packet writing driver. The logic for switching between reading and writing has been changed so that streaming writes are no longer interrupted by read requests. Signed-off-by:
Peter Osterlund <petero2@telia.com> Signed-off-by:
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