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af14713d49
freebsd-dev/sys
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Robert Watson af14713d49 Support run-time configuration of the PIPE_MINDIRECT threshold. 
PIPE_MINDIRECT determines at what (blocking) write size one-copy
optimizations are applied in pipe(2) I/O.  That threshold hasn't
been tuned since the 1990s when this code was originally
committed, and allowing run-time reconfiguration will make it
easier to assess whether contemporary microarchitectures would
prefer a different threshold.

(On our local RPi4 baords, the 8k default would ideally be at least
32k, but it's not clear how generalizable that observation is.)

MFC after:	3 weeks
Reviewers:	jrtc27, arichardson
Differential Revision: https://reviews.freebsd.org/D29819
2021-04-24 20:04:28 +01:00
..
amd64 linux: make ptrace(2) return EIO when trying to peek invalid address 2021-04-24 11:37:50 +01:00
arm arm: Add no-cftconvert for sdma-imx6 files 2021-04-14 15:43:37 +02:00
arm64 arm64: adjust comments in dbg_monitor_exit() 2021-04-13 14:41:31 -03:00
bsm Add aio_writev and aio_readv 2021-01-02 19:57:58 -07:00
cam cam: make sure to clear even more CCBs allocated on the stack 2021-04-11 15:24:22 +01:00
cddl fbt: Remove some handling for multiple CTF containers 2021-04-02 17:49:13 -04:00
compat linuxkpi: reduce number of stray mm_struct allocations 2021-04-19 21:34:08 +03:00
conf newvers.sh: better regexp for the FreeBSD_version line 2021-04-22 11:45:12 -06:00
contrib zfs: use vn_seqc_read_notmodify for racing .. lookups 2021-04-22 13:18:39 +00:00
crypto ossl: Don't encryt/decrypt too much data for chacha20. 2021-04-01 15:49:07 -07:00
ddb ddb: replace watchpoint set/clear functions 2021-03-29 12:05:44 -03:00
dev hkbd: Fix typo which disables keyboard input in kdb 2021-04-24 22:01:14 +03:00
dts dts: Bump the freebsd branding version to 5.10 2021-03-23 15:02:21 +01:00
fs nfsd: fix session slot handling for failed callbacks 2021-04-23 15:24:47 -07:00
gdb gdb: report specific stop reason for watchpoints 2021-03-30 11:36:41 -03:00
geom gmirror: Pre-allocate the timeout event structure 2021-03-11 15:45:15 -05:00
gnu Remove the old dts imported tree. 2021-01-15 20:09:55 +01:00
i386 Create VM_MEMATTR_DEVICE on all architectures 2021-04-12 06:15:31 +00:00
isa Remove more remnants of sio(4) 2021-04-07 14:33:02 -04:00
kern Support run-time configuration of the PIPE_MINDIRECT threshold. 2021-04-24 20:04:28 +01:00
kgssapi opencrypto: Introduce crypto_dispatch_async() 2021-02-08 09:19:19 -05:00
libkern x86: remove gcov kernel support 2021-04-02 15:41:51 +03:00
mips OCF: Remove support for asymmetric cryptographic operations. 2021-04-12 14:28:43 -07:00
modules modules: remove stale if_wg reference 2021-04-15 19:59:13 -05:00
net Re-enable network ioctls in capability mode 2021-04-23 09:22:49 -04:00
net80211 net80211: prefix get_random_bytes() with net80211_ 2021-03-24 22:16:09 +00:00
netgraph ng_ubt: Block attachment of uninitialized Intel Wireless 7265 2021-04-15 17:26:32 +03:00
netinet Allow the tcp_lro_flush_all() function to be called when the control 2021-04-24 12:23:42 +02:00
netinet6 Re-enable network ioctls in capability mode 2021-04-23 09:22:49 -04:00
netipsec Revert "SO_RERROR indicates that receive buffer overflows should be handled as errors." 2021-02-08 22:32:32 +00:00
netpfil Add required checks for unmapped mbufs in ipdivert and ipfw 2021-04-21 15:47:05 -04:00
netsmb
nfs Fix panic when using BOOTP to resolve root path. 2021-03-28 14:02:40 -05:00
nfsclient nfs: Cleanup dead files 2021-03-17 06:16:31 +11:00
nfsserver nfs: Cleanup dead files 2021-03-17 06:16:31 +11:00
nlm
ofed LinuxKPI/OFED: (re)move inetdevice.h implementation 2021-03-30 14:40:46 +00:00
opencrypto OCF: Remove support for asymmetric cryptographic operations. 2021-04-12 14:28:43 -07:00
powerpc opal_console: fix serial console output corruption on powerpc64 2021-04-16 20:10:09 -03:00
riscv riscv: Assert that SUM is not set in SSTATUS for exceptions. 2021-04-21 13:57:20 -07:00
rpc nfsv4 client: do the BindConnectionToSession as required 2021-04-11 14:34:57 -07:00
security tcp_input/syncache: acquire only read lock on PCB for SYN,!ACK packets 2021-04-12 08:25:31 -07:00
sys __FreeBSD_version: update the references to the doc tree 2021-04-22 17:36:22 +08:00
teken loader: implement framebuffer console 2021-01-02 21:41:36 +02:00
tests Add IPv4 fib lookup performance tests with uniform keys. 2021-03-30 14:32:28 +01:00
tools syscalls.master: Add a new syscall type: RESERVED 2021-01-26 18:27:44 +00:00
ufs b_vflags update requries bufobj lock 2021-04-15 15:47:42 +03:00
vm sysctl vm.objects: report backing object and swap use 2021-04-19 21:32:01 +03:00
x86 amd64: Add MD bits for KASAN 2021-04-13 17:42:20 -04:00
xdr
xen xen: move x86-specific xen_vector_callback_enabled to sys/x86 2021-03-15 14:20:21 +01:00
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