mirror of https://github.com/torvalds/linux.git
fc1f97929a
bond_start_xmit() spends some cycles in is_netpoll_tx_blocked():
if (unlikely(is_netpoll_tx_blocked(dev)))
return NETDEV_TX_BUSY;
because of the "pushf;pop reg" sequence (aka irqs_disabled()).
Let's swap the conditions in is_netpoll_tx_blocked() and
convert netpoll_block_tx to a static key.
Before:
1.23 │ mov %gs:0x28,%rax
1.24 │ mov %rax,0x18(%rsp)
29.45 │ pushfq
0.50 │ pop %rax
0.47 │ test $0x200,%eax
│ ↓ je 1b4
0.49 │ 32: lea 0x980(%rsi),%rbx
After:
0.72 │ mov %gs:0x28,%rax
0.81 │ mov %rax,0x18(%rsp)
0.82 │ nop
2.77 │ 2a: lea 0x980(%rsi),%rbx
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260223230749.2376145-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
|
||
|---|---|---|
| .. | ||
| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| cxl | ||
| drm | ||
| dt-bindings | ||
| hyperv | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rv | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| ufs | ||
| vdso | ||
| video | ||
| xen | ||
| Kbuild | ||