fixed the issues with file descriptor locks, but the same problems are
present for vnode lock/user map lock.
If the nfs_asyncio() cannot find the free nfsiod, schedule task to
create new nfsiod and return error. This causes fall back to the
synchronous i/o for nfs_strategy(), or does not start read at all in
the case of readahead. The caller that holds vnode and potentially
user map lock does not wait for kproc_create() to finish, preventing
the LORs.
The change effectively reverts r203072, because we never hand off the
request to newly created nfsiod thread anymore.
Reviewed by: jhb
Tested by: jhb, pluknet
MFC after: 3 weeks
- Implement proper combined mode decoding for Intel controllers to properly
identify SATA and PATA channels and associate ATA channels with SATA ports.
This fixes wrong reporting and in some cases hard resets to wrong SATA ports.
- Improve SATA registers support to handle hot-plug events and potentially
interface errors. For ICH5/6300ESB chipsets these registers accessible via
PCI config space. For later ones they may be accessible via PCI BAR(5).
- For controllers not generating interrupts on hot-plug events, implement
periodic status polling. Use it to detect hot-plug on Intel and VIA
controllers. Same probably could also be used for Serverworks and SIS.
data. White space should be accepted anywhere in a base64 encoded
stream, not just after every chunk (4 characters).
Test-scenario:
VmVsb2NpdHkgUmV3YXJkcw==
and
VmVsb2NpdHkgUmV3YXJkcw
==
should both produce "Velocity Rewards"
PR: bin/124739
Submitted by: Mark Andrews <marka@isc.org>
MFC after: 2 weeks
functions set or get pthread_rwlock type, current supported types are:
PTHREAD_RWLOCK_PREFER_READER_NP,
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,
PTHREAD_RWLOCK_PREFER_WRITER_NP,
default is PTHREAD_RWLOCK_PREFER_WRITER_NONCECURSIVE_NP, this maintains
binary compatible with old code.
root file system (starting with devfs and a synthesized configuration) can
contain directives for mounting another file system as root. The old root
file system is re-mounted under the new root file system (with /.mount or
/mnt as the mount point) to allow access to the underlying file system.
The configuration allows for creating vnode-backed memory disks that can
subsequently be mounted as root. This allows for an efficient and low-
cost way to distribute and boot FreeBSD software images that reside on
some storage media.
When trying a mount, the kernel will wait for the device in question to
arrive. The timeout is configurable and is part of the configuration.
This allows arbitrarily complex GEOM configurations to be constructed
on the fly.
A side-effect of this change is that all root specifications, whether
compiled into the kernel or typed at the prompt can contain root mount
options.
To protect against malicious software, we demand that the file name is at
a particular location (i.e. appended to the mdio structure) for it to be
treated as in-kernel.
counter on SMU-based systems, which causes FreeBSD to reject the RTC time
when used in a dual-boot environment. Since we don't use the day-of-week
counter anyway, solve this by just not checking that it matches.
MFC after: 3 weeks
drift in order to achieve a more stable clock as the tick intervals may
vary in the first place. In fact I haven't seen this code kick in when
in oneshot-mode so just skip it in that case.
- There's no need to explicitly stop the (S)TICK counter in oneshot-mode
with every tick as it just won't trigger again with the (S)TICK compare
register set to a value in the past (with a wrap-around once every ~195
years of uptime at 1.5 GHz this isn't something we have to worry about
in practice).
- Given that we'll disable interrupts completely anyway there's no
need to enter critical sections.
- In thr_exit() and kthread_exit(), only remove thread from
hash if it can directly exit, otherwise let exit1() do it.
- In thread_suspend_check(), fix cleanup code when thread needs
to exit.
This change seems fixed the "Bad link elm " panic found by
Peter Holm.
Stress testing: pho
This should make vnode_pager_getpages path a bit shorter and clearer.
Also this should eliminate problems with partially valid pages.
Having this method opens room for future optimizations.
To do: try to satisfy other pages besides the required one taking into
account tradeofs between number of page faults, read throughput and read
latency. Also, eventually vop_putpages should be added too.
Reviewed by: kib, mm, pjd
MFC after: 3 weeks
Make it harder to exploit certain in_control() related races between the
intiial lookup at the beginning and the time we will remove the entry
from the lists by re-checking that entry is still in the list before
trying to remove it.
(*) It is believed that with the current code and locking strategy we
cannot completely fix all race.
Reported by: Nima Misaghian (nima_misa hotmail.com) on net@ 20100817
Tested by: Nima Misaghian (nima_misa hotmail.com) (original version)
PR: kern/146250
Submitted by: Mikolaj Golub (to.my.trociny gmail.com) (different version)
MFC after: 1 week
important for USB 2.0 devices and some of them reported to have problems
with large transactions. But USB 3.0 benchmarks show that limited number
of transactions per second on USB makes impossible to reach high transfer
speeds without using bigger transactions.
On my tests this change allows to read up to 220MB/s from USB-attached SSD
(at block size of 256-512KB), comparing to only 113MB/s without it.
Reviewed by: hselasky
over all interfaces to make sure the address will neither change nor be
freed while we are working on it.
PR: kern/146250
Submitted by: Mikolaj Golub (to.my.trociny gmail.com)
MFC after: 1 week
For multi-command pipelines,
1. all commands are direct children of the shell (unlike the original
Bourne shell)
2. all commands are executed in a subshell (unlike the real Korn shell)
MFC after: 1 week
- Add missing check for ugd_actlen being too small.
- Add missing inclusion guard to usbvar.h header file.
- This also fixes buildworld breakage since r213852.
Old scrolls tell that once upon a time IBM AT BIOS was known to put some
useful system diagnostic information into RTC NVRAM. It is not really
known if and for how long PC BIOSes followed that convention, but I
believe that many, if not all, modern BIOSes do not do that any more
(not mentioning other types of x86 firmware).
Some diagnostic bits don't even make any sense any longer.
The check results in confusing messages upon boot on some systems.
So I am removing it.
Discussed with: bde, jhb, mav
MFC after: 3 weeks
Move debug.ncnegfactor to vfs.ncnegfactor [1].
Provide some descriptions for the namecache related sysctls [1].
Based on the submission by: Rogier R. Mulhuijzen <drwilco drwilco net> [1]
MFC after: 2 weeks
X-MFC-note: remove debug.ncnegfactor in HEAD after MFC
too coarse grained to be useful and the default value significantly degrades TCP
performance on moderate to high bandwidth-delay product paths with non-zero loss
(e.g. 5+Mbps connections across the public Internet often suffer).
Replace the outgoing mechanism with an individual per-queue limit based on the
number of MSS segments that fit into the socket's receive buffer. This should
strike a good balance between performance and the potential for resource
exhaustion when FreeBSD is acting as a TCP receiver. With socket buffer
autotuning (which is enabled by default), the reassembly queue tracks the
socket buffer and benefits too.
As the XXX comment suggests, my testing uncovered some unexpected behaviour
which requires further investigation. By using so->so_rcv.sb_hiwat
instead of sbspace(&so->so_rcv), we allow more segments to be held across both
the socket receive buffer and reassembly queue than we probably should. The
tradeoff is better performance in at least one common scenario, versus a devious
sender's ability to consume more resources on a FreeBSD receiver.
Sponsored by: FreeBSD Foundation
Reviewed by: andre, gnn, rpaulo
MFC after: 2 weeks
"net.inet.tcp.reass.maxsegments" sysctl variables to be based on UMA zone
stats. The value returned by the cursegments sysctl is approximate owing to
the way in which uma_zone_get_cur is implemented.
- Discontinue use of V_tcp_reass_qsize as a global reassembly segment count
variable in the reassembly implementation. The variable was used without
proper synchronisation and was duplicating accounting done by UMA already. The
lack of synchronisation was particularly problematic on SMP systems
terminating many TCP sessions, resulting in poor TCP performance for
connections with non-zero packet loss.
Sponsored by: FreeBSD Foundation
Reviewed by: andre, gnn, rpaulo (as part of a larger patch)
MFC after: 2 weeks
rounding. The same value can also be obtained with uma_zone_get_max, but this
change avoids a caller having to make two back-to-back calls.
Sponsored by: FreeBSD Foundation
Reviewed by: gnn, jhb
- Add uma_zone_get_cur which returns the current approximate occupancy of
a zone. This is useful for providing stats via sysctl amongst other things.
Sponsored by: FreeBSD Foundation
Reviewed by: gnn, jhb
MFC after: 2 weeks
