used, serves very little value given that FreeBSD runs on real H/W
for a long time.
Note that SKI is open-source (see http://ski.sourceforge.net), so
if there's interest and value again, then this code can be revived.
Discussed with: jhb
link is lost. devd will start a new dhclient instance when link is
restored.
PR: bin/166656
Submitted by: Peter Jeremy (mostly)
Reviewed by: brooks (earlier version from Peter)
MFC after: 1 month
segments for the entire allocation to use kmem_alloc_attr() to allocate
KVM rather than using kmem_alloc_contig(). This avoids requiring
a single physically contiguous chunk in this case.
Submitted by: Peter Jeremy (original version)
MFC after: 1 month
assure that *all* tables and such are removed before
we start to free. This won't protect the Hash in ip_input.c
but in theory should protect any other uses that *do* use locks.
MFC after: 1 week (or more)
First, pmap_clear_modify() is write protecting all mappings to the specified
page, not just clearing the modified bit. Specifically, it sets PTE_RO on
the PTE, which is wrong. Moreover, it is calling vm_page_dirty(), which is
not the expected behavior for pmap_clear_modify(). Generally speaking, the
machine-independent VM layer masks these mistakes. For example, setting
PTE_RO will result in additional soft faults, but not a catastrophe.
Second, pmap_clear_modify() may not clear the modified bits because it only
iterates over the PV list when the page has the PV_TABLE_MOD flag set and
elsewhere the pmap clears the PV_TABLE_MOD flag anytime a modified mapping
is write protected or destroyed. However, the page may still have other
mappings with the modified bit set.
Eliminate a stale comment.
Magic tests containing "search" or "regex" directives were incorrectly
compiled by "mkmagic" and were effectively ignored. This caused troff
files (for example) to be detected as simply "ASCII text" instead of
as "troff or preprocessor input, ASCII text".
PR: bin/170415
Approved by: consensus on developers@
MFC after: 3 days
timestamp related stack variables to reference ms directly instead of ticks.
The h_ertt(4) Khelp module relies on TCP timestamp information in order to
calculate its enhanced RTT estimates, but was not updated as part of r231767.
Consequently, h_ertt has not been calculating correct RTT estimates since
r231767 was comitted, which in turn broke all delay-based congestion control
algorithms because they rely on the h_ertt RTT estimates.
Fix the breakage by switching h_ertt to use tcp_ts_getticks() in place of all
previous uses of the ticks variable. This ensures all timestamp related
variables in h_ertt use the same units as the TCP stack and therefore results in
meaningful comparisons and RTT estimate calculations.
Reported & tested by: Naeem Khademi (naeemk at ifi uio no)
Discussed with: bz
MFC after: 3 days
Basically, this is automatic rx zero copy when feasible. TCP payload is
DMA'd directly into the userspace buffer described by the uio submitted
in soreceive by an application.
- Works with sockets that are being handled by the TCP offload engine
of a T4 chip (you need t4_tom.ko module loaded after cxgbe, and an
"ifconfig +toe" on the cxgbe interface).
- Does not require any modification to the application.
- Not enabled by default. Use hw.t4nex.<X>.toe.ddp="1" to enable it.
- Setup multiple DDP page sizes. When the driver attempts DDP it will
try to combine physically contiguous pages into regions of these sizes.
- Set the indicate size such that the payload carried in the indicate can
be copied in the header mbuf (and the 16K rx buffer can be recycled).
- Set DDP threshold to the max payload that the chip will coalesce and
deliver to the driver (this is ~16K by default, which is also why the
offload rx queue is backed by 16K buffers). If the chip is able to
coalesce up to the max it's allowed to, it's a good sign that the peer
is transmitting in bulk without any TCP PSH.
MFC after: 2 weeks
TCB. Filters are programmed by modifying the TCB too (via a different
routine) and the reply to any TCB update is delivered via a
CPL_SET_TCB_RPL. Figure out whether the reply is for a filter-write or
something else and route it appropriately.
MFC after: 2 weeks
makes calls out to the emulator, the locking is fairly simple. A global
mutex protects the list of ssc disks, and each ssc disk has a mutex
to protect it's bioq.
Approved by: marcel
tick until the situation is resolved (if ever), just print a single
message when running out and another when space becomes available.
- When adding more swap, warn if the total amount exceeds half the
theoretical maximum we can handle.
