The uart(4) driver has the advantage of supporting a wider variety of
hardware on a greater amount of platforms. This driver has already been
the standard on platforms such as ia64, powerpc and sparc64.
I've decided not to change anything on pc98. I'd rather let people from
the pc98 team look at this.
Approved by: philip (mentor), marcel
set MNT_UPDATE in fsflags, and delete the
"update" option from the global mount options.
MNT_UPDATE is a command, and not a property of a mount
that should persist after the command is executed.
We need to do similar things for MNT_FORCE and MNT_RELOAD.
All mount flags are prefixed by MNT_..... it would
be nice if flags which were commands were named differently
from flags which are persistent properties of a mount.
This was not such a big deal in the pre-nmount() days,
but with nmount() it is more important.
Requested by: yar
MFC after: 2 weeks
1. The FreeBSD driver was setting an interrupt coalesce delay of 1000us
for reasons that I can only speculate on. This was hurting everything
from lame sequential I/O "benchmarks" to legitimate filesystem metadata
operations that relied on serialized barrier writes. One of my
filesystem tests went from 35s to complete down to 6s.
2. Implemented the Performant transport method. Without the fix in
(1), I saw almost no difference. With it, my filesystem tests showed
another 5-10% improvement in speed. It was hard to measure CPU
utilization in any meaningful way, so it's not clear if there was a
benefit there, though there should have been since the interrupt handler
was reduced from 2 or more PCI reads down to 1.
3. Implemented MSI-X. Without any docs on this, I was just taking a
guess, and it appears to only work with the Performant method. This
could be a programming or understanding mistake on my part. While this
by itself made almost no difference to performance since the Performant
method already eliminated most of the synchronous reads over the PCI
bus, it did allow the CISS hardware to stop sharing its interrupt with
the USB hardware, which in turn allowed the driver to become decoupled
from the Giant-locked USB driver stack. This increased performance by
almost 20%. The MSI-X setup was done with 4 vectors allocated, but only
1 vector used since the performant method was told to only use 1 of 4
queues. Fiddling with this might make it work with the simpleq method,
not sure. I did not implement MSI since I have no MSI-specific hardware
in my test lab.
4. Improved the locking in the driver, trimmed some data structures.
This didn't improve test times in any measurable way, but it does look
like it gave a minor improvement to CPU usage when many
processes/threads were doing I/O in parallel. Again, this was hard to
accurately test.
USB isochronous transfer support is required for Bluetooth SCO.
While i'm here change u_int to uint and update TODO.
This should produce no visible changes unless the device is
broken (or really old).
MFC after: 3 months
for the bio for swapout write. It allows the page allocator to drain
free page list deeper. As result, a deadlock where pageout deamon sleeps
waiting for bio to be allocated for swapout is no more reproducable in
practice.
Alan said that M_USE_RESERVE shall be ressurrected and used there, but
until this is implemented, M_NOWAIT does exactly what is needed.
Tested by: pho, kris
Reviewed by: alc
No objections from: phk
MFC after: 2 weeks (RELENG_7 only)
SI_ALIAS flag and initialization of the si_parent when alias is created.
Assert that supplied parent device is not NULL.
Both situations could cause NULL dereference in the
devfs_populate_loop() when creating a symlink for SI_ALIAS'ed device.
Namely, cdp->cdp_c.si_parent may be NULL.
Reported by: mav
MFC after: 2 weeks
As a result, those arguments must be recombined before calling the real
syscal implementation. This change fixes 32-bit compatibility for
cpuset_getid(), cpuset_setid(), cpuset_getaffinity(), and
cpuset_setaffinity().
udp_output() so that argument validation occurs before jail processing.
Add additional comments explaining what's going on when we process
addresses and binding during udp_output().
MFC after: 3 weeks
Initialize %ds, %es, and %fs during CPU startup. Otherwise a garbage
value could leak to a 32-bit process if a process migrated to a different
CPU after exec and the new CPU had never exec'd a 32-bit process.
A more complete fix is needed, but this mitigates the most frequent
manifestations.
Obtained from: ups
it's non-NULL, as all callers can and should already do the required
checking. Update comments a bit more to talk about rawcb allocation
for consumers.
Reviewed by: bz
MFC after: 3 weeks
it in detail.
When setting media, don't error out when a specific media is selected.
# Note: There may be some issues still here since the EtherJet PC Card doesn't
# conform to the datasheet. Many different kinds of dongles can be plugged in
# and it is unknown how to ask which one it is.
Also, add a /* bad! */ comment to a 1/2 second delay after we set the
DC/DC parameters. This should be a *sleep of some sort for !cold.
Fortunately it is the only one and is only used when setting media, so
the benefit from removing it is small. Unfortunately, it likely
serves as an exemplar of good programming techniques, which it isn't.
2) Adds some __UserSpace__ on some of the common defines that
the user space code needs
3) Fixes a bug when we send up data to a user that failed. We
need to a) trim off the data chunk headers, if present, and
b) make sure the frag bit is communicated properly for the
msgs coming off the stream queues... i.e. we see if some
of the msg has been taken.
Obtained from: jeli contributed the VIMAGE changes on this pass Thanks Julain!
socket support. These utility routines are used only for routing and
pfkey sockets, neither of which have a notion of address, so were
required to mock up fake socket addresses to avoid connection
requirements for applications that did not specify their own fake
addresses (most of them).
Quite a bit of the removed code is #ifdef notdef, since raw sockets
don't support bind() or connect() in practice. Removing this
simplifies the raw socket implementation, and removes two (commented
out) uses of dtom(9).
Fake addresses passed to sendto(2) by applications are ignored for
compatibility reasons, but this is now done in a more consistent way
(and with a comment). Possibly, EINVAL could be returned here in
the future if it is determined that no applications depend on the
semantic inconsistency of specifying a destination address for a
protocol without address support, but this will require some amount
of careful surveying.
NB: This does not affect netinet, netinet6, or other wire protocol
raw sockets, which provide their own independent infrastructure with
control block address support specific to the protocol.
MFC after: 3 weeks
Reviewed by: bz
when it worked as generic IDE.
PR: 125422
Submitted by: Andrey V. Elsukov <bu7cher at yandex dot ru>
Approved by: imp (mentor, implicit)
MFC after: 1 week
generation of RTL810x PCIe fast ethernet controller. Note, Tx/Rx
descriptor format is different from that of first generation of
RTL8101E series. Jumbo frame is not supported for RTL810x
family.
Tested by: NAGATA Shinya ( maya AT negeta DOT com )
mutexes and replacing the obsolete if_watchdog interface. The ndis_ticktask
function calls into ieee80211_new_state under one condition with NDIS_LOCK
held. The ieee80211_new_state would call into ndis_start in some cases too,
resulting in the occasional case where ndis_start acquires NDIS_LOCK from
inside the NDIS_LOCK held by ndis_ticktask.
Obtained from: Paul B. Mahol <onemda@gmail.com>
MFC after: 1 week
page directory pages from VM_MIN_KERNEL_ADDRESS through the end of the
kernel's bss. Specifically, the dependence was in pmap_growkernel()'s one-
time initialization of kernel_vm_end, not in its main body. (I could not,
however, resist the urge to optimize the main body.)
Reduce the number of preallocated page directory pages to just those needed
to support NKPT page table pages. (In fact, this allows me to revert a
couple of my earlier changes to create_pagetables().)
