* [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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* [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
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* [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.
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end of thread, other threads:[~2019-05-13 12:41 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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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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