optimization.
This fixes building with gcc-4.2.1 (it doesn't support SSE4).
gas-2.17.50 [FreeBSD] supports SSE4 instructions, so this doesn't
need using .byte directives.
This fixes depending on host user headers in the kernel.
Fix user includes (don't depend on namespace pollution in <nmmintrin.h>
that is not included now).
The instrinsics had no advantages except to sometimes avoid compiler
pessimixations. clang understands them a bit better than inline asm,
and generates better looking code which also runs better for cem, but
for me it just at the same speed or slower by doing excessive
unrollowing in all the wrong places. gcc-4.2.1 also doesn't understand
what it is doing with unrolling, but with -O3 somehow it does more
unrolling that helps.
Reduce 1 of the the compiler pessimizations (copying a variable which
already satisfies an "rm" constraint in a good way by being in memory
and not used again, to different memory and accessing it there. Force
copying it to a register instead).
Try to optimize the inner loops significantly, so as to run at full
speed on smaller inputs. The algorithm is already very MD, and was
tuned for the throughput of 3 crc32 instructions per cycle found on
at least Sandybridge through Haswell. Now it is even more tuned for
this, so depends more on the compiler not rearranging or unrolling
things too much. The main inner loop for should have no difficulty
runing at full speed on these CPUs unless the compiler unrolls it too
much. However, the main inner loop wasn't even used for buffers smaller
than 24K. Now it is used for buffers larger than 384 bytes. Now it
is not so long, and the main outer loop is used more. The new
optimization is to try to arrange that the outer loop runs in parallel
with the next inner loop except for the final iteration; then reduce
the loop sizes significantly to take advantage of this.
Approved by: cem
Not tested in production by: bde
Some code was additionally moved for (future) lock splitting.
Tested with Intel 6205, STA mode.
Differential Revision: https://reviews.freebsd.org/D10106
We don't have enouch space to store full VFP context within mcontext
stucture. Due to this:
- follow i386/amd64 way and store VFP state outside of the mcontext_t
but point to it. Use the size of VFP state structure as an 'magic'
indicator of the saved VFP state presence.
- teach set_mcontext() about this external storage.
- for signal delivery, store VFP state to expanded 'struct sigframe'.
Submited by: Andrew Gierth (initial version)
PR: 217611
MFC after: 2 weeks
Kernel environment variable hw.busdma.default can take values 'bounce'
and 'dmar' and selects corresponding busdma backend as default.
Per-device environment variable hw.busdma.pci<domain>.<bus>.<slot>.<func>
takes the same values and overrides hw.busdma.default for the given device.
Note that even with hw.busdma.default=bounce, DMA translation engines
are still started if DMARs are enabled, to disable them use
hw.dmar.dma tunable, as before.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
FreeBSD uses upstream DTB for RPi3 build and compatibility string for
i2c device is different there. Add this new string to compatibility data.
Reported by: Karl Denninger
MFC after: 3 days
Do not try to use errno(2) codes here; instead, just return unique
value (1) when radio is disabled via hardware switch and another
one (-1) for any other error in initialization path.
Tested with Intel 6205, STA mode.
The change is more intrusive than I would like because the feature
requires that a vector number is written to a special register.
Thus, now the vector number has to be provided to lapic_eoi().
It was readily available in the IO-APIC and MSI cases, but the IPI
handlers required more work.
Also, we now store the VMM IPI number in a global variable, so that it
is available to the justreturn handler for the same reason.
Reviewed by: kib
MFC after: 6 weeks
Differential Revision: https://reviews.freebsd.org/D9880
ip_forward, TCP/IPv6, and probably SCTP leaked references to L2 cache
entry because they used their own routes on the stack, not in_pcb routes.
The original model for route caching was callers that provided a route
structure to ip{,6}input() would keep the route, and this model was used
for L2 caching as well. Instead, change L2 caching to be done by default
only when using a route structure in the in_pcb; the pcb deallocation
code frees L2 as well as L3 cacches. A separate change will add route
caching to TCP/IPv6.
Another suggestion was to have the transport protocols indicate willingness
to use L2 caching, but this approach keeps the changes in the network
level
Reviewed by: ae gnn
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D10059
Update vendor/tcsh to git b605cb561d
Vendor changes:
1. PR/471: Daiki Ueno: Delay interpreting arginp until we've processed
our startup files (which can change the NLS environment).
2. Fix type of read in prompt confirmation (eg. rmstar) (David Kaspar).
3. Fix out of bounds read (Brooks Davis)
(reproduce by starting tcsh and hitting tab at the prompt).
4. Don't play pointer tricks that are undefined in modern c
(Brooks Davis).
Vendor changes:
1. PR/471: Daiki Ueno: Delay interpreting arginp until we've processed
our startup files (which can change the NLS environment).
2. Fix type of read in prompt confirmation (eg. rmstar) (David Kaspar).
3. Fix out of bounds read (Brooks Davis)
(reproduce by starting tcsh and hitting tab at the prompt).
4. Don't play pointer tricks that are undefined in modern c
(Brooks Davis).
Interesting fixes which were not already merged:
0c7c611 Merge C++ demangler bug fixes from ELF Tool Chain (#40)
2b208d9 __cxa_demangle_gnu3: demangle 'z' as '...', not 'ellipsis' (#41)
MFC after: 3 days
As noted in the comment, nothing special needs to be done to destroy
the unneeded context after the allocation race, but the context memory
itself still should to be freed.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
It does not make sense since identity mapping already provides the
required mapping for RMRR ranges. More, since identity page tables do
not reflect content of map entries for id domains, creating RMRR
entries makes domain data inconsistent.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
This can significantly reduce scan duration thus saving time and power.
EBS failure reported by FW disables EBS for current connection. It is
re-enabled upon new connection attempt on any WLAN interface.
Obtained from: dragonflybsd.git 89f579e9823a5c446ca172cf82bbc210d6a054a4
If this is the last running vap wait until device will be powered off
(fixes panic when 'ifconfig wlan0 destroy' is executed for running iwn(4)
interface).
Tested with:
- Intel 6205, STA mode.
- RTL8188EU, STA / IBSS modes.
- RTL8821AU, STA / HOSTAP modes.
Long ago, perhaps only on i386, kernel text was mapped read-only and
it was necessary to change the mapping to read-write to set breakpoints
in kernel text. Other writes by ddb to kernel text were also allowed.
This write protection is harder to implement with 4MB pages, and was
lost even for 4K pages when 4MB pages were implemented. So changing
the mapping became useless. It was actually worse than useless since
it followed followed various null and otherwise garbage pointers to
not change random memory instead of the mapping. (On i386s, the
pointers became good in pmap_bootstrap(), and on amd64 the pointers
became bad in pmap_bootstrap() if not before.)
Another bug broke detection of following of null pointers on i386,
except early in boot where not detecting this was a feature. When
I fixed the bug, I accidentally broke the feature and soon got traps
in db_write_bytes(). Setting breakpoints early in ddb was broken.
kib pointed out that a clean way to do the adjustment would be to use
a special [sub]map giving a small window on the bytes to be written.
The trap handler didn't know how to fix up errors for pagefaults
accessing the map itself. Such errors rarely need fixups, since most
traps for the map are for the first access which is a read.
Reviewed by: kib
crash when the file shrinks. This also fixes sendfile(2) not sending more
data in a case when the file grows, and the request is open-ended or
specifies a size that is greater than old file size.
PR: 217789
Reviewed by: gallatin
MFC after: 10 days
- in mcontext_t, rename newer used 'union __vfp' to equaly sized 'mc_spare'.
Space allocated by 'union __vfp' is too small and cannot hold full
VFP context.
- move structures defined in fp.h to more appropriate headers.
- remove all unused VFP structures.
MFC after: 2 weeks
illumos/illumos-gate@8363e80ae7https://github.com/illumos/illumos-gate/commit/8363e80ae72609660f6090766ca8c2c18https://www.illumos.org/issues/7303
This change introduces a new weighting algorithm to improve metaslab selection.
The new weighting algorithm relies on the SPACEMAP_HISTOGRAM feature. As a result,
the metaslab weight now encodes the type of weighting algorithm used
(size-based vs segment-based).
This also introduce a new allocation tracing facility and two new dcmds to help
debug allocation problems. Each zio now contains a zio_alloc_list_t structure
that is populated as the zio goes through the allocations stage. Here's an
example of how to use the tracing facility:
> c5ec000::print zio_t io_alloc_list | ::walk list | ::metaslab_trace
MSID DVA ASIZE WEIGHT RESULT VDEV
- 0 400 0 NOT_ALLOCATABLE ztest.0a
- 0 400 0 NOT_ALLOCATABLE ztest.0a
- 0 400 0 ENOSPC ztest.0a
- 0 200 0 NOT_ALLOCATABLE ztest.0a
- 0 200 0 NOT_ALLOCATABLE ztest.0a
- 0 200 0 ENOSPC ztest.0a
1 0 400 1 x 8M 17b1a00 ztest.0a
> 1ff2400::print zio_t io_alloc_list | ::walk list | ::metaslab_trace
MSID DVA ASIZE WEIGHT RESULT VDEV
- 0 200 0 NOT_ALLOCATABLE mirror-2
- 0 200 0 NOT_ALLOCATABLE mirror-0
1 0 200 1 x 4M 112ae00 mirror-1
- 1 200 0 NOT_ALLOCATABLE mirror-2
- 1 200 0 NOT_ALLOCATABLE mirror-0
1 1 200 1 x 4M 112b000 mirror-1
- 2 200 0 NOT_ALLOCATABLE mirror-2
If the metaslab is using segment-based weighting then the WEIGHT column will
display the number of segments available in the bucket where the allocation
attempt was made.
Author: George Wilson <george.wilson@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Chris Siden <christopher.siden@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <paul.dagnelie@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Don Brady <don.brady@intel.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
I got a report of this source file not building on Raspberry Pi. It's
interesting that this only fails for that target and not for others.
Again, that's no reason not to include the right headers.
PR: 217969
Reported by: Johannes Jost Meixner
MFC after: 1 week