From: Yehowshua <yimmanuel3@gatech.edu>
To: Libre-RISCV General Development <libre-riscv-dev@lists.libre-riscv.org>
Subject: [libre-riscv-dev] Scoreboard vs Tomasulo
Date: Sat, 16 May 2020 10:04:52 -0400
Message-ID: <13EDF987-9A19-4C96-89C2-6DB784CF2C96@gatech.edu> (raw)
This website gives an excellent comparison
https://www.cs.umd.edu/~meesh/cmsc411/website/projects/dynamic/intro.html <https://www.cs.umd.edu/~meesh/cmsc411/website/projects/dynamic/intro.html>
In general, it sits that Tomasulo is a distributed scoreboard.
The biggest drawback of Tomasulo is the central data bus as the messaging scheme. One could use a mesh NOC between functional units.
Given that we have well over 15 functional units, I would have thought a distributed scoreboard instead of a centralized one makes more sense.
Of course, I have no numbers to back this up. But these are just some thoughts.
I know we’re using a ring/circular buffer for messaging at the moment.
Given that we have hard deadlines and limited resources, we can stick with this. But these are questions I do wonder about the answer to. I wonder if there are any papers where this has been explored at sufficient depth to draw conclusions.
Yehowshua
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Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-16 14:04 Yehowshua [this message]
2020-05-16 15:00 ` Luke Kenneth Casson Leighton
2020-05-16 15:06 ` Luke Kenneth Casson Leighton
2020-05-16 15:13 ` Luke Kenneth Casson Leighton
2020-05-16 15:16 ` Luke Kenneth Casson Leighton
2020-05-16 15:19 ` Luke Kenneth Casson Leighton
2020-05-16 15:23 ` Luke Kenneth Casson Leighton
2020-05-16 15:52 ` Luke Kenneth Casson Leighton
2020-05-16 15:59 ` Yehowshua
2020-05-16 17:33 ` Luke Kenneth Casson Leighton
2020-05-16 20:16 ` Jeremy Singher
2020-05-16 21:37 ` Luke Kenneth Casson Leighton
2020-05-16 22:45 ` Jeremy Singher
2020-05-17 0:47 ` Yehowshua
2020-05-17 0:53 ` Luke Kenneth Casson Leighton
2020-05-17 5:24 ` [libre-riscv-dev] LD/ST Comp Unit FSM (was: Re: Scoreboard vs Tomasulo) Cesar Strauss
2020-05-17 10:07 ` Luke Kenneth Casson Leighton
2020-05-17 12:59 ` Cesar Strauss
2020-05-17 13:03 ` Luke Kenneth Casson Leighton
2020-05-17 22:23 ` Luke Kenneth Casson Leighton
2020-05-17 22:42 ` Cesar Strauss
2020-05-17 23:01 ` Luke Kenneth Casson Leighton
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