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Re: [PATCH gnumach 1/2] ipc: tune size of cached kernel message buffers
From: |
Samuel Thibault |
Subject: |
Re: [PATCH gnumach 1/2] ipc: tune size of cached kernel message buffers |
Date: |
Tue, 16 Dec 2014 17:03:55 +0100 |
User-agent: |
Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30) |
Justus Winter, le Tue 16 Dec 2014 15:09:46 +0100, a écrit :
> The previous limit was 256 bytes. That seems a little crummy by
> todays standards, and we are frequently sending bigger packets
> (e.g. every RPC containing a string_t on Hurd).
>
> Use the page size for IKM_SAVED_KMSG_SIZE to make sure the page is
> pinned to a single processor.
Ack.
> * ipc/ipc_kmsg.h (IKM_SAVED_KMSG_SIZE): Define to `PAGE_SIZE'.
> ---
> ipc/ipc_kmsg.h | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/ipc/ipc_kmsg.h b/ipc/ipc_kmsg.h
> index 07695fb..f06857a 100644
> --- a/ipc/ipc_kmsg.h
> +++ b/ipc/ipc_kmsg.h
> @@ -92,9 +92,12 @@ extern ipc_kmsg_t ipc_kmsg_cache[NCPUS];
> /*
> * The size of the kernel message buffers that will be cached.
> * IKM_SAVED_KMSG_SIZE includes overhead; IKM_SAVED_MSG_SIZE doesn't.
> + *
> + * We use the page size for IKM_SAVED_KMSG_SIZE to make sure the
> + * page is pinned to a single processor.
> */
>
> -#define IKM_SAVED_KMSG_SIZE ((vm_size_t) 256)
> +#define IKM_SAVED_KMSG_SIZE PAGE_SIZE
> #define IKM_SAVED_MSG_SIZE ikm_less_overhead(IKM_SAVED_KMSG_SIZE)
>
> #define ikm_alloc(size)
> \
> --
> 2.1.3
>
--
Samuel
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