From: Jakub Kicinski <kuba@kernel.org>
To: Jesper Dangaard Brouer <jbrouer@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>,
brouer@redhat.com,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
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KY Srinivasan <kys@microsoft.com>,
Paul Rosswurm <paulros@microsoft.com>,
"olaf@aepfle.de" <olaf@aepfle.de>,
"vkuznets@redhat.com" <vkuznets@redhat.com>,
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Long Li <longli@microsoft.com>,
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Ajay Sharma <sharmaajay@microsoft.com>,
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<shradhagupta@linux.microsoft.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>
Subject: Re: [PATCH net-next] net: mana: Add page pool for RX buffers
Date: Fri, 14 Jul 2023 08:31:52 -0700 [thread overview]
Message-ID: <20230714083152.3f64d38a@kernel.org> (raw)
In-Reply-To: <3b043a95-a4bc-bbaf-c8e0-240e8ddea62f@redhat.com>
On Fri, 14 Jul 2023 15:13:15 +0200 Jesper Dangaard Brouer wrote:
> > Thank Jakub and Jesper for the reviews.
> > I'm aware of the page_pool.rst doc, and actually tried it before this
> > patch, but I got lower perf. If I understand correctly, we should call
> > page_pool_release_page() before passing the SKB to napi_gro_receive().
> >
> > I found the page_pool_dev_alloc_pages() goes through the slow path,
> > because the page_pool_release_page() let the page leave the pool.
> >
> > Do we have to call page_pool_release_page() before passing the SKB
> > to napi_gro_receive()? Any better way to recycle the pages from the
> > upper layer of non-XDP case?
> >
>
> Today SKB "upper layers" can recycle page_pool backed packet data/page.
>
> Just use skb_mark_for_recycle(skb), then you don't need
> page_pool_release_page().
>
> I guess, we should update the documentation, mentioning this.
Ah, I should probably send in the few cleanups form the huge page
series. It looks like all users of page_pool_release_page() can
be converted to skb recycling, so we should hide it and remove
from docs?
next prev parent reply other threads:[~2023-07-14 15:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-13 14:48 [PATCH net-next] net: mana: Add page pool for RX buffers Haiyang Zhang
2023-07-14 3:53 ` Jakub Kicinski
2023-07-14 7:43 ` Jesper Dangaard Brouer
2023-07-14 12:51 ` Haiyang Zhang
2023-07-14 13:13 ` Jesper Dangaard Brouer
2023-07-14 15:31 ` Jakub Kicinski [this message]
2023-07-17 18:26 ` Haiyang Zhang
2023-07-17 23:59 ` Zhu Yanjun
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