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Re: [Qemu-devel] [PATCH v3 0/2] coroutine: dynamically scale pool size
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/2] coroutine: dynamically scale pool size |
Date: |
Fri, 1 Aug 2014 14:15:32 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Mon, Jul 07, 2014 at 03:15:51PM +0200, Stefan Hajnoczi wrote:
> v3:
> * Use COROUTINE_POOL_RESERVATION constant in block.c [Lluis]
>
> v2:
> * Assert that callers never reduce pool below default size [eblake]
>
> The coroutine pool reuses exited coroutines to make qemu_coroutine_create()
> cheap. The size of the pool is capped to prevent it from hogging memory after
> a period of high coroutine activity. Previously the max size was hardcoded to
> 64 but this doesn't scale with guest size.
>
> A guest with lots of disks can do more parallel I/O and therefore requires a
> larger coroutine pool size. This series tries to solve the problem by scaling
> pool size according to the number of drives.
>
> Ming has confirmed that this patch series, together with his block plug/unplug
> series, solves the dataplane performance regression in QEMU 2.1.
>
> Stefan Hajnoczi (2):
> coroutine: make pool size dynamic
> block: bump coroutine pool size for drives
>
> block.c | 6 ++++++
> include/block/coroutine.h | 11 +++++++++++
> qemu-coroutine.c | 26 +++++++++++++++++++++++---
> 3 files changed, 40 insertions(+), 3 deletions(-)
Thanks, applied to my block-next tree:
https://github.com/stefanha/qemu/commits/block
Stefan
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