Add remote bitbang write buffer. 83/6283/5
authorTim Newsome <tim@sifive.com>
Fri, 28 May 2021 20:38:50 +0000 (13:38 -0700)
committerAntonio Borneo <borneo.antonio@gmail.com>
Sun, 13 Jun 2021 18:58:08 +0000 (19:58 +0100)
commitf2958fc04bd879393fa743860478834e234f05d0
tree0e1d644008d249a3bd3050c6e404dbdd366b1ecd
parent076b4d708e14a830cffee64d39ad0a1940e13e2f
Add remote bitbang write buffer.

Change 7dd323b26 reduced remote bitbang performance a lot. This change
gets most of that performance back again, by reintroducing a write
buffer.

Performance numbers collected using DebugBreakpoint test from
riscv-tests/debug against a single 64-bit spike (RISC-V simulator)
instance. (Ubuntu 20.04.2, AMD Ryzen 5 3600)
Before Windows support was added: 3.09s
After Windows support was added: 12.67s
After this change: 4.69s

Signed-off-by: Tim Newsome <tim@sifive.com>
Change-Id: I72ff4912cbbf316a30ef065e5b8f461a555f06cc
Reviewed-on: http://openocd.zylin.com/6283
Tested-by: jenkins
Reviewed-by: Jan Matyas <matyas@codasip.com>
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
src/jtag/drivers/remote_bitbang.c

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