* [Bug 203571] New: may_use_simd() returns false in kworkers
@ 2019-05-11 5:01 bugzilla-daemon
2019-05-11 17:27 ` [Bug 203571] may_use_simd() returns false in soft irq context bugzilla-daemon
2019-05-13 12:39 ` [Bug 203571] Allow use of SIMD in interrupts on PowerPC bugzilla-daemon
0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2019-05-11 5:01 UTC (permalink / raw)
To: linuxppc-dev
https://bugzilla.kernel.org/show_bug.cgi?id=203571
Bug ID: 203571
Summary: may_use_simd() returns false in kworkers
Product: Platform Specific/Hardware
Version: 2.5
Kernel Version: 4.19
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: PPC-64
Assignee: platform_ppc-64@kernel-bugs.osdl.org
Reporter: slandden@gmail.com
Regression: No
This patch optimizing chacha20 for WireGuard
https://github.com/shawnl/WireGuard/commit/3e02fce92a14cba7b7d1e2733def3a51bec97498
doesn't work because may_use_simd() is always returning false in kworkers. If I
remove the check everything seems to work fine.
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^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug 203571] may_use_simd() returns false in soft irq context 2019-05-11 5:01 [Bug 203571] New: may_use_simd() returns false in kworkers bugzilla-daemon @ 2019-05-11 17:27 ` bugzilla-daemon 2019-05-13 12:39 ` [Bug 203571] Allow use of SIMD in interrupts on PowerPC bugzilla-daemon 1 sibling, 0 replies; 3+ messages in thread From: bugzilla-daemon @ 2019-05-11 17:27 UTC (permalink / raw) To: linuxppc-dev https://bugzilla.kernel.org/show_bug.cgi?id=203571 --- Comment #1 from Shawn Landden (slandden@gmail.com) --- ▒ - 11.41% 0.01% kworker/1:2-mm_ [kernel.vmlinux] [k] process_one_work ▒ - 11.41% process_one_work ▒ - 10.28% wg_packet_tx_worker ▒ - 10.06% wg_socket_send_skb_to_peer ▒ - 7.38% _raw_read_unlock_bh ▒ - 7.35% __local_bh_enable_ip ▒ - 7.34% do_softirq.part.2 ▒ - 7.31% do_softirq_own_stack ▒ + 7.28% call_do_softirq ▒ - 2.45% send4 ▒ - 1.85% udp_tunnel_xmit_skb ▒ - 1.66% iptunnel_xmit ▒ - 1.33% ip_local_out ▒ - 1.14% ip_output ▒ - 1.06% ip_finish_output2 ▒ + 0.99% __dev_queue_xmit ▒ - 1.06% wg_packet_encrypt_worker ▒ - 1.03% encrypt_packet ▒ - 0.98% chacha20poly1305_encrypt_sg ▒ 0.59% chacha20 -- You are receiving this mail because: You are watching the assignee of the bug. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug 203571] Allow use of SIMD in interrupts on PowerPC 2019-05-11 5:01 [Bug 203571] New: may_use_simd() returns false in kworkers bugzilla-daemon 2019-05-11 17:27 ` [Bug 203571] may_use_simd() returns false in soft irq context bugzilla-daemon @ 2019-05-13 12:39 ` bugzilla-daemon 1 sibling, 0 replies; 3+ messages in thread From: bugzilla-daemon @ 2019-05-13 12:39 UTC (permalink / raw) To: linuxppc-dev https://bugzilla.kernel.org/show_bug.cgi?id=203571 --- Comment #2 from Shawn Landden (slandden@gmail.com) --- X86 manages to allow SIMD in interrupts through some very careful code in arch/x86/kernel/fpu/core.c (starting with irq_fpu_usable()) PowerPC can do the same. -- You are receiving this mail because: You are watching the assignee of the bug. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-05-13 12:41 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2019-05-11 5:01 [Bug 203571] New: may_use_simd() returns false in kworkers bugzilla-daemon 2019-05-11 17:27 ` [Bug 203571] may_use_simd() returns false in soft irq context bugzilla-daemon 2019-05-13 12:39 ` [Bug 203571] Allow use of SIMD in interrupts on PowerPC bugzilla-daemon
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