From: Stefano Brivio <sbrivio@redhat.com>
To: Laurent Vivier <lvivier@redhat.com>
Cc: passt-dev@passt.top
Subject: Re: [PATCH v7 0/8] Add vhost-user support to passt. (part 3)
Date: Thu, 10 Oct 2024 09:52:32 +0200 [thread overview]
Message-ID: <20241010095232.5b71c92b@elisabeth> (raw)
In-Reply-To: <6cb94183-e665-42be-8191-bf2cf730672e@redhat.com>
On Thu, 10 Oct 2024 09:45:36 +0200
Laurent Vivier <lvivier@redhat.com> wrote:
> On 10/10/2024 09:08, Stefano Brivio wrote:
> > For outbound traffic (I tried with IPv4), which is much slower for some
> > reason (~25 Gbps):
>
> Perhaps because we can't bypass IPv4 header checksum whereas there is no IPv6 header
> checksum ?
Ah, no, sorry, I meant slower than inbound traffic. For outbound
traffic, I get very similar numbers between IPv4 and IPv6. And judging
from perf output, it's all about copying and zeroing and stuff.
As far as I know the kernel doesn't actually compute checksum, delivery
is local.
--
Stefano
next prev parent reply other threads:[~2024-10-10 7:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-09 9:07 [PATCH v7 0/8] Add vhost-user support to passt. (part 3) Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 1/8] packet: replace struct desc by struct iovec Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 2/8] vhost-user: introduce virtio API Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 3/8] vhost-user: introduce vhost-user API Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 4/8] udp: Prepare udp.c to be shared with vhost-user Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 5/8] tcp: Export headers functions Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 6/8] passt: rename tap_sock_init() to tap_backend_init() Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 7/8] vhost-user: add vhost-user Laurent Vivier
2024-10-09 9:07 ` [PATCH v7 8/8] test: Add tests for passt in vhost-user mode Laurent Vivier
2024-10-09 13:07 ` [PATCH v7 0/8] Add vhost-user support to passt. (part 3) Stefano Brivio
2024-10-09 14:50 ` Laurent Vivier
2024-10-09 17:37 ` Stefano Brivio
2024-10-10 7:08 ` Stefano Brivio
2024-10-10 7:43 ` Laurent Vivier
2024-10-10 7:45 ` Laurent Vivier
2024-10-10 7:52 ` Stefano Brivio [this message]
2024-10-11 18:07 ` Stefano Brivio
2024-10-17 0:10 ` Stefano Brivio
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