Messages in this thread | | | Subject | Re: [PATCH v4 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall | From | Akira Tsukamoto <> | Date | Mon, 19 Jul 2021 23:00:13 +0900 |
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On 7/19/2021 10:51 PM, Guenter Roeck wrote: > Hi, > > On 7/19/21 5:53 AM, Akira Tsukamoto wrote: >> >> This patch will reduce cpu usage dramatically in kernel space especially >> for application which use sys-call with large buffer size, such as >> network applications. The main reason behind this is that every >> unaligned memory access will raise exceptions and switch between s-mode >> and m-mode causing large overhead. >> > > I had to revert the original patch from the mainline kernel prior to applying > this patch. Obviously that means that there may be other changes affecting the > outcome. > > riscv64 images work, but riscv32 images still fail with this patch applied. > The error is a bit different than before, though. > > ... > [ 11.899979] Run /sbin/init as init process > [ 12.152666] random: fast init done > moun: applet not found > "�����V�t: applet not found > /bi�����V�F-: applet not found > moun: applet not found > swaon: applet not found > hostname-F: applet not found > > After this, the image hangs. > > For comparison, the mainline kernel (v5.14-rc2) fails as follows. > > [ 10.788105] Run /sbin/init as init process > Starting syslogd: OK > Starting klogd: OK > /etc/init.d/S02sysctl: line 68: syntax error: EOF in backquote substitution > /etc/init.d/S20urandom: line 1: syntax error: unterminated quoted string > Starting network: /bin/sh: syntax error: unterminated quoted string > sed: unmatched '/' > /bin/sh: syntax error: unterminated quoted string > FAIL > /etc/init.d/S55runtest: line 48: syntax error: EOF in backquote substitution > > I'll be happy to provide information on how to reproduce the problem > if needed. Please let me know.
Yes, I do would like to know the procedure of build instruction of your rv32 image. Then I would reproduce the error and look into how to fix it.
Akira
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