any queued packets for the isr, process those packets before the newly
submitted packet, maintaining ordering of all packets being delivered
to the netisr. Remove the bypass counter since we don't bypass anymore.
Leave the comment about possible problems and options since later
performance optimization may change the strategy for addressing ordering
problems here.
Specifically, this maintains the strong isr ordering guarantee; additional
parallelism and lower latency may be possible by moving to weaker
guarantees (per-interface, for example). We will probably at some point
also want to remove the one instance netisr dispatch limit currently
enforced by a mutex, but it's not clear that's 100% safe yet, even in
the netperf branch.
Reviewed by: sam, others
o move route_cb to be private to rtsock.c
o replace global static route_proto by locals
o eliminate global #define shorthands for info references
o remove some register decls
o ansi-fy function decls
o move items to be close in scope to their usage
o add rt_dispatch function for dispatching the actual message
o cleanup tangled logic for doing all-but-me msg send
Support by: FreeBSD Foundation
RTF_STATIC routes. Do not check for RTF_HOST so as to avoid being DoSed
when an RTF_GENMASK route exists in the table.
Add a more verbose comment about exactly what this code does.
Submitted by: ru
frame marker) and the syscall stub frame info in the trap frame.
Previously we stored the stub frame info in (rp,pfs) and the
caller frame info in (iip,cfm). This ends up being suboptimal
for the following reasons:
1. When we create a new context, such as for an execve(2), we had
to set the (rp,pfs) pair for the entry point when using the
syscall path out of the kernel but we need to set the (iip,cfm)
pair when we take the interrupt way out. This is mostly just
an inconsistency from the kernel's point of view, but an ugly
irregularity from gdb(1)'s point of view.
2. The getcontext(2) and setcontext(2) syscalls had to swap the
(rp,pfs) and (iip,cfm) pairs to make the context compatible
with one created purely in userland.
Swapping the (rp,pfs) and (iip,cfm) pairs is visible to signal
handlers that actually peek at the mcontext_t and to gdb(1).
Since this change is made for gdb(1) and we don't care about
signal handlers that peek at the mcontext_t because we're still
a tier 2 platform, this ABI breakage is academic at this moment
in time.
Note that there was no real reason to save the caller frame info
in (iip,cfm) and the stub frame info in (rp,pfs).
validating the offset within a given memory buffer before handing the
real work off to uiomove(9).
Use uiomove_frombuf in procfs to correct several issues with
integer arithmetic that could result in underflows/overflows. As a
side-effect, the code is significantly simplified.
Add additional sanity checks when computing a memory allocation size
in pfs_read.
Submitted by: rwatson (original uiomove_frombuf -- bugs are mine :-)
Reported by: Joost Pol <joost@pine.nl> (integer underflows/overflows)
And many changes.
* all
- Major change of struct fw_xfer.
o {send,recv}.buf is splitted into hdr and payload.
o Remove unnecessary fields.
o spd is moved under send and recv.
- Remove unnecessary 'volatile' keyword.
- Add definition of rtcode and extcode.
* firewire.c
- Ignore FWDEVINVAL devices in fw_noderesolve_nodeid().
- Check the existance of the bind before call STAILQ_REMOVE().
- Fix bug in the fw_bindadd().
- Change element of struct fw_bind for simplicity.
- Check rtcode of response packet.
- Reduce split transaction timeout to 200 msec.
(100msec is the default value in the spec.)
- Set watchdog timer cycle to 10 Hz.
- Set xfer->tv just before calling fw_get_tlabel().
* fwohci.c
- Simplifies fwohci_get_plen().
* sbp.c
- Fix byte order of multibyte scsi_status informations.
- Split sbp.c and sbp.h.
- Unit number is not necessary for FIFO¤ address.
- Reduce LOGIN_DELAY and SCAN_DELAY to 1 sec.
- Add some constants defineded in SBP-2 spec.
* fwmem.c
- Introduce fwmem_strategy() and reduce memory copy.
fd_cmask field in the file descriptor structure for the first process
indirectly from CMASK, and when an fd structure is initialized before
being filled in, and instead just use CMASK. This appears to be an
artifact left over from the initial integration of quotas into BSD.
Suggested by: peter
avoid problems with some Pentium 4 cpus and some older PPro/Pentium2
cpus. There are several problems, some documented in Intel errata.
This patch:
1) moves the kernel to the second page in the PSE case. There is an
errata that says that you Must Not point a 4MB page at physical
address zero on older cpus. We avoided bugs here due to sheer luck.
2) sets up PSE page tables right from the start in locore, rather than
trying to switch from 4K to 4M (or 2M) pages part way through the boot
sequence at the same time that we're messing with PG_G.
For some reason, the pmap work over the last 18 months seems to tickle
the problems, and the PAE infrastructure changes disturb the cpu
bugs even more.
A couple of people have reported a problem with APM bios calls during
boot. I'll work with people to get this resolved.
Obtained from: bmilekic
(direct dispatch) in interrupt threads when the netisr in question
isn't already active. If a netisr is already active, or direct
dispatch is already in progress, we queue the packet for later
delivery. Previously, this option was disabled by default. I have
measured 20%+ performance improvements in IP packet forwarding with
this enabled.
Please report any problems ASAP, especially relating to stack depth or
out-of-order packet processing.
Discussed with: jlemon, peter
Sponsored by: DARPA, Network Associates Laboratories
was that accessing the status reg could occour too fast, confusing
the logic in the flash part. Could not have been located without:
HW donated by: Jonas Bülow <jonas@servicefactory.se>
prior to invalidating the TLB to be certain that the processor doesn't
keep a cached copy.
Discussed with: pete
Paniced: tegge
Pointy Hat: The usual spot
evaluating them at compile time rather than at run time. As for x86
and amd64, this requires GCC and it's enabled only if __OPTIMIZE__ is
defined (ie, if at least -O is used).
Reviewed by: jake
Their purpose is to give explicit hints to the compiler to judge
the likelyhood of a test to succeed or fail. Not all architectures
have support for such optimizations, but for those who do, it can
give a nice performance improvement in hot loops.
Obviously, this should be used very rarely in very specific code.
Reviewed by: peter
Obtained from: OpenBSD
AcpiEnterSleepState() calling a long AcpiOsStall() with interrupts
disabled. This fix will instead be added to ACPI-CA.
PR:
Submitted by:
Reviewed by:
Approved by:
Obtained from:
MFC after:
