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20a8fc967a
freebsd-skq/sys
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jtl 20a8fc967a Address concerns about CPU usage while doing TCP reassembly. 
Currently, the per-queue limit is a function of the receive buffer
size and the MSS.  In certain cases (such as connections with large
receive buffers), the per-queue segment limit can be quite large.
Because we process segments as a linked list, large queues may not
perform acceptably.

The better long-term solution is to make the queue more efficient.
But, in the short-term, we can provide a way for a system
administrator to set the maximum queue size.

We set the default queue limit to 100.  This is an effort to balance
performance with a sane resource limit.  Depending on their
environment, goals, etc., an administrator may choose to modify this
limit in either direction.

Reviewed by:	jhb
Approved by:	so
Security:	FreeBSD-SA-18:08.tcp
Security:	CVE-2018-6922
2018-08-06 17:36:57 +00:00
..
amd64 efirt: Don't enter EFI context early, convert addrs to KVA instead 2018-08-04 21:41:10 +00:00
arm Default to armv5te in LINT on arm. This should fix building LINT there. 2018-08-06 14:40:45 +00:00
arm64 efirt: Don't enter EFI context early, convert addrs to KVA instead 2018-08-04 21:41:10 +00:00
bsm
cam For the dynamic I/O scheduler, make the TRIM stuff also count against 2018-07-26 22:55:51 +00:00
cddl Reduce taskq and context-switch cost of zio pipe 2018-08-03 02:16:45 +00:00
compat Implement current_work() function in the LinuxKPI. 2018-08-06 10:48:20 +00:00
conf Remove jedec_ts(4) 2018-08-01 08:24:34 +00:00
contrib Use the new VNET_DEFINE_STATIC macro when we are defining static VNET 2018-07-24 16:35:52 +00:00
crypto libmd: Always erase context in _Final method, and when doing 2018-07-20 07:01:28 +00:00
ddb Extend show proc with reaper, sigparent, and vmspace information 2018-05-25 13:59:48 +00:00
dev uep(4): add evdev support 2018-08-05 11:14:13 +00:00
dts Remove Atmel AT91RM9200 and AT91SAM9 support. 2018-07-27 18:28:22 +00:00
fs Copy all bits of a file handle in case there is padding in the structure. 2018-08-05 19:21:50 +00:00
gdb
geom OpenCrypto: Convert sessions to opaque handles instead of integers 2018-07-18 00:56:25 +00:00
gnu dts: Update our copy to Linux 4.17 2018-06-14 07:12:10 +00:00
i386 Add pmap_is_valid_memattr(9). 2018-08-01 18:45:51 +00:00
isa
kern Swap in WKILLED processes. 2018-08-04 20:45:43 +00:00
kgssapi OpenCrypto: Convert sessions to opaque handles instead of integers 2018-07-18 00:56:25 +00:00
libkern Sync strlcpy with userland version, again 2018-06-21 17:35:13 +00:00
mips Add pmap_is_valid_memattr(9). 2018-08-01 18:45:51 +00:00
modules uep(4): add evdev support 2018-08-05 11:14:13 +00:00
net pf: Increase default hash table size 2018-08-05 13:54:37 +00:00
net80211 net80211: Fix ifdetach w/o ifattach, small whitespace cleanup 2018-07-10 23:30:19 +00:00
netgraph Use if_tunnel_check_nesting() for ng_iface(4). 2018-08-03 22:55:58 +00:00
netinet Address concerns about CPU usage while doing TCP reassembly. 2018-08-06 17:36:57 +00:00
netinet6 Add a dtrace provider for UDP-Lite. 2018-07-31 22:56:03 +00:00
netipsec Use the new VNET_DEFINE_STATIC macro when we are defining static VNET 2018-07-24 16:35:52 +00:00
netpfil Use the new VNET_DEFINE_STATIC macro when we are defining static VNET 2018-07-24 16:35:52 +00:00
netsmb Make timespecadd(3) and friends public 2018-07-30 15:46:40 +00:00
nfs Switch RIB and RADIX_NODE_HEAD lock from rwlock(9) to rmlock(9). 2018-06-16 08:26:23 +00:00
nfsclient
nfsserver
nlm
ofed Only NULL check the VNET pointer when VIMAGE is enabled in ibcore. 2018-07-31 11:23:44 +00:00
opencrypto Make timespecadd(3) and friends public 2018-07-30 15:46:40 +00:00
powerpc Add pmap_is_valid_memattr(9). 2018-08-01 18:45:51 +00:00
riscv Return ENAMETOOLONG if the latest copied character 2018-08-03 16:44:56 +00:00
rpc Set SO_SNDTIMEO in the client side krpc when CLSET_TIMEOUT is done. 2018-07-20 12:03:16 +00:00
security Require that MAC label buffers be able to store a non-empty string. 2018-08-01 03:46:07 +00:00
sparc64 Add pmap_is_valid_memattr(9). 2018-08-01 18:45:51 +00:00
sys efirt: Don't enter EFI context early, convert addrs to KVA instead 2018-08-04 21:41:10 +00:00
teken teken: Fix sequences header which was crossing the 80-col boundary 2018-05-29 08:41:44 +00:00
tests epoch_test: fix compile 2018-07-15 00:31:17 +00:00
tools
ufs Avoid assertion in /dev/ufssuspend when the suspend ioctl is 2018-08-01 19:06:55 +00:00
vm Swap in WKILLED processes. 2018-08-04 20:45:43 +00:00
x86 Verify that each frame pointer lies within the thread's kstack. 2018-08-03 02:51:37 +00:00
xdr
xen xen: add missing file from r336474 2018-07-19 10:14:52 +00:00
Makefile