linux-kernel - Re: [PATCH V1] bootconfig: Increase max nodes of bootconfig from 1024 to 8192 for DCC support

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Date:   Mon, 13 Mar 2023 15:02:12 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Heinz Wiesinger <pprkut@...ckware.com>
Cc:     quic_schowdhu@...cinc.com, andersson@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, quic_rjendra@...cinc.com,
        quic_saipraka@...cinc.com, quic_sibis@...cinc.com
Subject: Re: [PATCH V1] bootconfig: Increase max nodes of bootconfig from
 1024 to 8192 for DCC support

On Sun, 12 Mar 2023 12:49:44 +0100
Heinz Wiesinger <pprkut@...ckware.com> wrote:

> Hi everyone,

Oops, thanks for pointing it out. I have to run the test in the test environment...


> 
> It looks like this broke the bootconfig tests (tools/bootconfig/test-
> bootconfig.sh), tested on 6.1.18:
> 
> Max node number check
> test case 12 (./bootconfig -a ./temp-HCfT.bconf ./initrd-NGHv)...
> Apply ./temp-HCfT.bconf to ./initrd-NGHv
>         Number of nodes: 1024
>         Size: 8110 bytes
>         Checksum: 599485
> \t\t[OK]
> test case 13 (./bootconfig -a ./temp-HCfT.bconf ./initrd-NGHv)...
> Apply ./temp-HCfT.bconf to ./initrd-NGHv
>         Number of nodes: 1025
>         Size: 8118 bytes
>         Checksum: 600212
> \t\t[NG]

Yes, it needs to test with 8192 and 8193 nodes. Those are
boundary checker.

Thanks!

> 
> When I adjust the max node number for the tests to 8192, test case 13 passes, 
> but test case 12 then fails:
> 
> Max node number check
> test case 12 (./bootconfig -a ./temp-qZHF.bconf ./initrd-0v99)...
> Error: Config data is too big.
> \t\t[NG]
> test case 13 (./bootconfig -a ./temp-qZHF.bconf ./initrd-0v99)...
> Error: Config data is too big.
> \t\t[OK]

Ah, it hits the size limitation. :D

Each node consumes "node%d\n" = 6-11 bytes, and 11 bytes*8k = 88k bytes > 32K bytes.
So, for making 8k nodes (including delimiter), we need to use 3 random alphabets for
node name. (26^3 = 17576)

Let me fix that and thanks for report!



> 
> Grs,
> Heinz


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>