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d1a07e31e5
freebsd-dev/sys
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Konstantin Belousov d1a07e31e5 Enable eager FPU context switch by default on amd64. 
With compilers making increasing use of vector instructions the
performance benefit of lazily switching FPU state is no longer a
desirable tradeoff.  Linux switched to eager FPU context switch some
time ago, and the idea was floated on the FreeBSD-current mailing list
some years ago[1].

Enable eager FPU context switch by default on amd64, with a tunable/sysctl
available to turn it back off.

[1] https://lists.freebsd.org/pipermail/freebsd-current/2015-March/055198.html

Reviewed by:	jhb
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
2018-06-13 17:55:09 +00:00
..
amd64 Enable eager FPU context switch by default on amd64. 2018-06-13 17:55:09 +00:00
arm hwpmc: remove hwpmc_xscale.c from corresponding arm build 2018-06-08 18:24:46 +00:00
arm64 Add ThunderX2 to the list of CPUs we need to apply the branch predictor 2018-06-13 15:58:33 +00:00
bsm
cam Enable high-speed on the card before increasing frequency on the controller 2018-06-05 11:03:24 +00:00
cddl This originated from ZFS On Linux, as 2018-06-08 17:38:28 +00:00
compat Oops, r335053 had an old version of the comment about 16-bit linux dev_t 2018-06-13 12:44:45 +00:00
conf Add support for the ARM SMC Calling Convention (SMCCC). This is a method 2018-06-13 15:32:00 +00:00
contrib [ath_hal] Return failure if noise floor calibration fails. 2018-06-08 18:21:57 +00:00
crypto disable printing value of SKEIN_LOOP during standard out, 2018-05-19 18:27:14 +00:00
ddb Extend show proc with reaper, sigparent, and vmspace information 2018-05-25 13:59:48 +00:00
dev Add the SMCCC return codes from ARM DEN 0070A. 2018-06-13 15:41:22 +00:00
dts arm: overlays: Update to new path-based sugar format 2018-05-04 14:38:48 +00:00
fs Fix the encoding of major and minor numbers in 64-bit dev_t by restoring 2018-06-13 12:22:00 +00:00
gdb
geom Introduce the 'n' flag for the geli attach command. 2018-05-09 20:53:38 +00:00
gnu gnu/dts: Update our copy of arm dts from Linux 4.16 2018-04-20 19:37:08 +00:00
i386 Make UMA and malloc(9) return non-executable memory in most cases. 2018-06-13 17:04:41 +00:00
isa Revert r330780, it was improperly tested and results in taking a spin 2018-03-11 20:13:15 +00:00
kern Make UMA and malloc(9) return non-executable memory in most cases. 2018-06-13 17:04:41 +00:00
kgssapi
libkern str(r)chr: Replace union abuse with __DECONST 2018-06-04 18:47:14 +00:00
mips hwpmc: yet another missed fixup 2018-06-08 18:54:47 +00:00
modules linux64: use linux output target for linux_vdso.so 2018-06-12 13:32:42 +00:00
net Make UMA and malloc(9) return non-executable memory in most cases. 2018-06-13 17:04:41 +00:00
net80211 Use an accessor function to access ifr_data. 2018-03-30 18:50:13 +00:00
netgraph Catch up two more places to the V_ifnet change to a CK_STAILQ. 2018-05-24 00:06:55 +00:00
netinet Rework if_gre(4) to use encap_lookup_t method to speedup lookup 2018-06-13 11:11:33 +00:00
netinet6 Rework if_gre(4) to use encap_lookup_t method to speedup lookup 2018-06-13 11:11:33 +00:00
netipsec uma: implement provisional api for per-cpu zones 2018-06-08 21:40:03 +00:00
netpfil pf: Fix deadlock with route-to 2018-06-09 14:17:06 +00:00
netsmb Eliminate the overhead of gratuitous repeated reinitialization of cap_rights 2018-05-09 18:47:24 +00:00
nfs Merge the pNFS server code from projects/pnfs-planb-server into head. 2018-06-12 19:36:32 +00:00
nfsclient
nfsserver
nlm
ofed UDP: further performance improvements on tx 2018-05-23 21:02:14 +00:00
opencrypto cryptosoft: Do not exceed crd_len around *crypt_multi 2018-04-19 15:24:21 +00:00
powerpc powerpc64/powernv: Avoid type promotion 2018-06-12 19:50:33 +00:00
riscv Don't jump to VA space until kernel is ready. 2018-06-13 10:32:21 +00:00
rpc
security audit(4): fix the definition of ARG_TERMID_ADDR 2018-06-13 14:55:31 +00:00
sparc64 Define memmove and make bcopy alt entry point 2018-05-24 21:11:28 +00:00
sys Make UMA and malloc(9) return non-executable memory in most cases. 2018-06-13 17:04:41 +00:00
teken teken: Fix sequences header which was crossing the 80-col boundary 2018-05-29 08:41:44 +00:00
tests epoch(9): Make epochs non-preemptible by default 2018-05-18 17:29:43 +00:00
tools Add dtb overlays support 2018-03-24 21:30:24 +00:00
ufs ufs: remove cgbno variable where unused 2018-05-19 19:30:42 +00:00
vm Make UMA and malloc(9) return non-executable memory in most cases. 2018-06-13 17:04:41 +00:00
x86 Untangle configuration ifdefs a little. On x86, msi is optional on pci, 2018-06-10 14:49:13 +00:00
xdr
xen xen: remove dead code from gnttab.h 2018-05-25 08:44:00 +00:00
Makefile