[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Mach lack for frequent operations
|
From: |
pancake |
|
Subject: |
Re: Mach lack for frequent operations |
|
Date: |
Thu, 1 Dec 2005 13:19:43 +0100 |
The GNU/Mach misses lot of optimization tips.
Most of these tips was discussed in the Hurdmeeting:
- Memory objects cache doesn't works.
- Main function (mach_msg) length is 1300 lines.
- No multipage transfer support (k0ro fixes that)
- Fork is a hard cost operation.
Implementing transfers by object references may increase the performance for
most IPC operations in the Mach. (no user-kernel kernel-user transactions).
-pancake
On Thu, 01 Dec 2005 01:34:30 +0100
<ams@gnu.org> wrote:
> Sorry for the late response.
>
> Can anyone explain why that overhead happen in Mach?
>
> The large overhead is mostly related to how the Hurd uses Mach.
> Running a single-user server system gets you quite decent performance,
> but we have a multi-sever design, where the number of context
> switches, and IPC overhead is becomes far larger.
>
>
> _______________________________________________
> Bug-hurd mailing list
> Bug-hurd@gnu.org
> http://lists.gnu.org/mailman/listinfo/bug-hurd