embryonic connection has been setup and never attempt to abort a tid
before this is done. This fixes a bad race where a listening socket is
closed when the driver is in the middle of step (b) here. The symptom
of this were "ARP miss" errors from the driver followed by tid leaks.
A hardware-offloaded passive open works this way:
a) A SYN "hits" the TCAM entry for a server tid and the chip delivers it
to the queue associated with the server tid (say, queue A). It waits
for a response from the driver telling it what to do.
b) The driver decides it is ok to proceed. It adds the new tid to the
list of embryonic connections associated with the server tid and then
hands off the SYN to the kernel's syncache to make sure that the kernel
okays it too. If it does then the driver provides an L2 table entry,
queue id (say, queue B), etc. and instructs the chip to send the SYN/ACK
response.
c) The chip delivers a status to queue B depending on how the third step
of the 3-way handshake goes. The driver removes the tid from its list
of embryonic connections and either expands the syncache entry or
destroys the tid. In any case all subsequent messages for the new tid
will be delivered to queue B, not queue A. Anything running in queue B
knows that the L2 entry has long been setup and the new flag is of no
interest from here on. If the listener is closed it will deal with
so_comp as normal.
MFC after: 1 week
for bridge interface.
- If we found a collision we can break the loop - only one collision is
possible and one is exactly enough to need to renegerate.
Obtained from: WHEEL Systems
MFC after: 1 week
variable as they may overflow on i386/PAE and i386 with > 2GB RAM.
Use 64bit quad_t instead. It has broader kernel infrastructure support
with TUNABLE_QUAD_FETCH() and qmin/qmax() than other available types.
Pointed out by: alc, bde
but LDFLAGS is not (yet) passed on to the linker (via SYSTEM_LD et al).
Do so now. As such, any kernel configuration can now define linker
flags by setting LDFLAGS as normal and not have to revert to hacks
like setting DEBUG for flags that do not relate to debugging (see
sys/powerpc/conf/MPC85XX).
Make the following interface changes to my beastie boot menu:
+ Move boot options to a submenu
+ Add a new "Boot Single" menu item
+ Make "Boot" item and new "Boot Single" item reverse when boot_single is set
+ Add new "Load Defaults" item (in new "Boot Options" submenu) for overridding
loader.conf(5) provided values with system defaults.
Reviewed by: adrian (co-mentor)
Approved by: adrian (co-mentor)
Bring several definitions required for newer ext4 features.
Rename EXT2F_COMPAT_HTREE to EXT2F_COMPAT_DIRHASHINDEX since it
is not being used yet and the new name is more compatible with
NetBSD and Linux.
This change is purely cosmetic and has no effect on the real
code.
Obtained from: NetBSD
MFC after: 3 days
When a file is first being written, the dynamic block reallocation
(implemented by ext2_reallocblks) relocates the file's blocks
so as to cluster them together into a contiguous set of blocks on
the disk.
When the cluster crosses the boundary into the first indirect block,
the first indirect block is initially allocated in a position
immediately following the last direct block. Block reallocation
would usually destroy locality by moving the indirect block out of
the way to keep the data blocks contiguous.
The issue was diagnosed long ago by Bruce Evans on ffs and surfaced
on ext2fs when block reallocaton was ported. This is only a partial
solution based on the similarities with FFS. We still require more
review of the allocation details that vary in ext2fs.
Reported by: bde
MFC after: 1 week
Rick Macklem and I discussed the default number of nfsd threads and
concluded that it is too low to perform adiquitely on today's hardware.
We decided to auto tune the number of nfsds based on the number of cpus
in the system.
While I'm here I've also added:
1) ability to set the minthreads/maxthreads from userland.
2) ability to run nfsd in debug mode via the cli.
Reviewed by: rmacklem
MFC after: 2 weeks
which was to self-initialize during the first function-call. This didn't work
so well because the first call was may or may-not be within a sub-shell
(which prevented proper setup of the pass-thru file descriptor, resulting in
dialogs that would not display).
Approved by: adrian (co-mentor) (implicit)
kernel memory, whichever is lower. The overall mbuf related memory
limit must be set so that mbufs (and clusters of various sizes)
can't exhaust physical RAM or KVM.
The limit is set to half of the physical RAM or KVM (whichever is
lower) as the baseline. In any normal scenario we want to leave
at least half of the physmem/kvm for other kernel functions and
userspace to prevent it from swapping too easily. Via a tunable
kern.maxmbufmem the limit can be upped to at most 3/4 of physmem/kvm.
At the same time divorce maxfiles from maxusers and set maxfiles to
physpages / 8 with a floor based on maxusers. This way busy servers
can make use of the significantly increased mbuf limits with a much
larger number of open sockets.
Tidy up ordering in init_param2() and check up on some users of
those values calculated here.
Out of the overall mbuf memory limit 2K clusters and 4K (page size)
clusters to get 1/4 each because these are the most heavily used mbuf
sizes. 2K clusters are used for MTU 1500 ethernet inbound packets.
4K clusters are used whenever possible for sends on sockets and thus
outbound packets. The larger cluster sizes of 9K and 16K are limited
to 1/6 of the overall mbuf memory limit. When jumbo MTU's are used
these large clusters will end up only on the inbound path. They are
not used on outbound, there it's still 4K. Yes, that will stay that
way because otherwise we run into lots of complications in the
stack. And it really isn't a problem, so don't make a scene.
Normal mbufs (256B) weren't limited at all previously. This was
problematic as there are certain places in the kernel that on
allocation failure of clusters try to piece together their packet
from smaller mbufs.
The mbuf limit is the number of all other mbuf sizes together plus
some more to allow for standalone mbufs (ACK for example) and to
send off a copy of a cluster. Unfortunately there isn't a way to
set an overall limit for all mbuf memory together as UMA doesn't
support such a limiting.
NB: Every cluster also has an mbuf associated with it.
Two examples on the revised mbuf sizing limits:
1GB KVM:
512MB limit for mbufs
419,430 mbufs
65,536 2K mbuf clusters
32,768 4K mbuf clusters
9,709 9K mbuf clusters
5,461 16K mbuf clusters
16GB RAM:
8GB limit for mbufs
33,554,432 mbufs
1,048,576 2K mbuf clusters
524,288 4K mbuf clusters
155,344 9K mbuf clusters
87,381 16K mbuf clusters
These defaults should be sufficient for even the most demanding
network loads.
MFC after: 1 month
accept queues a new socket/connection may be added to the queue
due to a race on the ACCEPT_LOCK.
The submitted patch is slightly changed in comments, teardown
and locking order and extended with KASSERT's.
Submitted by: Vijay Singh <vijju.singh-at-gmail-dot-com>
Found by: His team.
MFC after: 1 week
now this works for non-debug and debug builds.
* Add a comment reminding me (or someone) to audit all of the relevant
math to ensure there's no weird wrapping issues still lurking about.
But yes, this does seem to be mostly working.
Pointy-hat-to: adrian, yet again
is in capability mode.
- Add VN_OPEN_NOCAPCHECK flag for vn_open_cred() to will ne converted into
NOCAPCHECK namei flag.
This functionality will be used to enable core dumps for sandboxed processes.
Reviewed by: rwatson
Obtained from: WHEEL Systems
MFC after: 2 weeks
to himself. For example abort(3) at first tries to do kill(getpid(), SIGABRT)
which was failing in capability mode, so the code was failing back to exit(1).
Reviewed by: rwatson
Obtained from: WHEEL Systems
MFC after: 2 weeks
