linux-kernel - Re: [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver

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Message-ID: <4073350.0MmxRoANOi@ada>
Date:   Wed, 28 Mar 2018 12:29:20 +0200
From:   Alexander Dahl <ada@...rsis.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 0/6] clocksource: rework Atmel TCB timer driver

Hello Daniel,

Am Dienstag, 27. März 2018, 13:30:22 CEST schrieb Daniel Lezcano:
> Can you can give a rough amount for the irq rate on the timer ?

I used itop [1] now to get a rough estimate. First with kernel v4.14.29-rt25 
(fully preempt RT):

INT                NAME          RATE             MAX
 19 [ vel     tc_clkevt]   397 Ints/s     (max:   432)
 26 [      vel     eth0]     4 Ints/s     (max:    38)

Next test with kernel v4.15.13 gives (slightly slower, but non-RT):

INT                NAME          RATE             MAX
 19 [ vel     tc_clkevt]   248 Ints/s     (max:   273)
 26 [      vel     eth0]     4 Ints/s     (max:    11)

With kernel v4.16-rc7 plus this patch series and tcb as clocksource:

INT                NAME          RATE             MAX
 17 [vel     timer@...a]  2164 Ints/s     (max:  2183)
 26 [      vel     eth0]     5 Ints/s     (max:    10)

Is this the information you wanted? If not, could you point me on how to get 
the requested irq rate?

Greets
Alex

[1] https://packages.debian.org/stretch/itop