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Re: [Qemu-devel] [PATCH v2] hw/net/opencores_eth: Allocating Large sized

From: Zhou Jie
Subject: Re: [Qemu-devel] [PATCH v2] hw/net/opencores_eth: Allocating Large sized arrays to heap
Date: Wed, 27 Apr 2016 10:51:21 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

On 2016/4/27 10:46, Max Filippov wrote:
Hi Zhou,

On Wed, Apr 27, 2016 at 10:18:56AM +0800, Zhou Jie wrote:
    When I committed another patch which named as
    "hw/net/virtio-net: Allocating Large sized arrays to heap" .

    Christian Borntraeger said that 16k is usually perfectly fine
    for a userspace stack and doing allocations in a hot path
    might actually hurt performance.

    Although the size is 65536 bytes here,
    I think open_eth_start_xmit is in a hot path.
    So, it is OK, if you think that this patch should not be applied.

With Linux as guest OS we shouldn't see any allocations
as it doesn't send huge packets, so I think this patch is fine.
I can take it through the xtensa tree if you don't have other

OK, Thanks

Zhou Jie

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