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Re: [Qemu-devel] [ RFC Patch v5 0/2] Support Receive-Segment-Offload(RSC

From: Jason Wang
Subject: Re: [Qemu-devel] [ RFC Patch v5 0/2] Support Receive-Segment-Offload(RSC) for WHQL
Date: Wed, 25 May 2016 16:08:50 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

On 2016年05月24日 16:26, Michael S. Tsirkin wrote:
On Tue, May 24, 2016 at 04:03:04PM +0800, Jason Wang wrote:
>On 2016年05月24日 04:14,address@hidden  wrote:
> >From: Wei Xu<address@hidden>
> >
> >Changes in V5:
> >- Passed all IPv4/6 test cases
> >- Add new fields in 'virtio_net_hdr'
> >- Set 'gso_type' & 'coalesced packets' in new field.
> >- Bypass all 'tcp option' packet
> >- Bypass all 'pure ack' packet
> >- Bypass all 'duplicate ack' packet
> >- Change 'guest_rsc' feature bit to 'false' by default
> >- Feedbacks from v4, typo, etc.
>Patch does not apply on master ...
> >
> >Note:
> >There is still a few pending issues about the feature bit, and need to be
> >discussed with windows driver maintainer, so linux guests with this patch
> >won't work at current, haven't figure it out yet, but i'm guessing it's
> >caused by the 'gso_type' is set to 'VIRTIO_NET_HDR_GSO_TCPV4/6',
> >will fix it after get the final solution, the below test steps and
> >performance data is based on v4.
>Can we split the patches into smaller ones to make review or merging easier?
>E.g can we send the patches without any feature negotiation and vnet header
>We can focus on the coalescing (maybe ipv4) without any guest involvement in
>this series. In this way, the issues were limited and can be converged soon.
>After this has been merged, we can add patches that co-operate with guests
>on top (since it needs agreement on virtio specs). Does this sounds a good
True but disabling everything when feature is not negotiated
reduces the risk somewhat.

Yes, but I believe we can only merge the patch with new virtio features after they were accepted by spec?

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