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Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for
From: |
Igor Mammedov |
Subject: |
Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit |
Date: |
Thu, 27 Feb 2020 15:13:13 +0100 |
On Thu, 27 Feb 2020 04:56:46 -0800
Richard Henderson <address@hidden> wrote:
> On 2/27/20 4:31 AM, Alex Bennée wrote:
> >> It does not make sense for a linux-user chroot, running make -jN, on just
> >> about
> >> any host. For linux-user, I could be happy with a modest increase, but
> >> not all
> >> the way out to 2GiB.
> >>
> >> Discuss.
> >
> > Does it matter that much? Surely for small programs the kernel just
> > never pages in the used portions of the mmap?
>
> That's why I used the example of a build under the chroot, because the
> compiler
> is not a small program.
>
> Consider when the memory *is* used, and N * 2GB implies lots of paging, where
> the previous N * 32MB did not.
>
> I'm saying that we should consider a setting more like 128MB or so, since the
> value cannot be changed from the command-line, or through the environment.
That's what BSD guys force tb-size to, to speed up system emulation.
>
>
> r~
>
- Re: [PATCH v1 3/4] accel/tcg: only USE_STATIC_CODE_GEN_BUFFER on 32 bit hosts, (continued)
- [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Alex Bennée, 2020/02/26
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Richard Henderson, 2020/02/26
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Alex Bennée, 2020/02/27
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Richard Henderson, 2020/02/27
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit,
Igor Mammedov <=
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Niek Linnenbank, 2020/02/27
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Igor Mammedov, 2020/02/28
- Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit, Alex Bennée, 2020/02/28
- [PATCH] accel/tcg: increase default code gen buffer size for 64 bit, Alex Bennée, 2020/02/28