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From: Stefano Brivio <sbrivio@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: passt-dev@passt.top
Subject: Re: [PATCH 08/14] tap: Remove unhelpeful vnet_pre optimization from tap_send()
Date: Tue, 18 Oct 2022 05:05:13 +0200	[thread overview]
Message-ID: <20221018050513.04fae95b@elisabeth> (raw)
In-Reply-To: <20221017085807.473470-9-david@gibson.dropbear.id.au>

On Mon, 17 Oct 2022 19:58:01 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> Callers of tap_send() can optionally use a small optimization by adding
> extra space for the 4 byte length header used on the qemu socket interface.
> tap_ip_send() is currently the only user of this, but this is used only
> for "slow path" ICMP and DHCP packets, so there's not a lot of value to
> the optimization.

Not anymore, definitely. It used to look quite bad in perf(1) when I
shuffled connection data around.

-- 
Stefano


  reply	other threads:[~2022-10-18  8:40 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-17  8:57 [PATCH 00/14] Clean up checksum and header generation for inbound packets David Gibson
2022-10-17  8:57 ` [PATCH 01/14] Add csum_icmp6() helper for calculating ICMPv6 checksums David Gibson
2022-10-18  3:01   ` Stefano Brivio
2022-10-18 12:05     ` David Gibson
2022-10-17  8:57 ` [PATCH 02/14] Add csum_icmp4() helper for calculating ICMPv4 checksums David Gibson
2022-10-18  3:01   ` Stefano Brivio
2022-10-18 12:06     ` David Gibson
2022-10-18 12:28       ` Stefano Brivio
2022-10-17  8:57 ` [PATCH 03/14] Add csum_udp6() helper for calculating UDP over IPv6 checksums David Gibson
2022-10-18  3:02   ` Stefano Brivio
2022-10-18 12:06     ` David Gibson
2022-10-17  8:57 ` [PATCH 04/14] Add csum_udp4() helper for calculating UDP over IPv4 checksums David Gibson
2022-10-18  3:03   ` Stefano Brivio
2022-10-18 12:06     ` David Gibson
2022-10-17  8:57 ` [PATCH 05/14] Add csum_ip4_header() helper to calculate IPv4 header checksums David Gibson
2022-10-18  3:03   ` Stefano Brivio
2022-10-18 12:07     ` David Gibson
2022-10-17  8:57 ` [PATCH 06/14] Add helpers for normal inbound packet destination addresses David Gibson
2022-10-18  3:04   ` Stefano Brivio
2022-10-18 12:07     ` David Gibson
2022-10-17  8:58 ` [PATCH 07/14] Remove support for TCP packets from tap_ip_send() David Gibson
2022-10-17  8:58 ` [PATCH 08/14] tap: Remove unhelpeful vnet_pre optimization from tap_send() David Gibson
2022-10-18  3:05   ` Stefano Brivio [this message]
2022-10-18 12:07     ` David Gibson
2022-10-17  8:58 ` [PATCH 09/14] Split tap_ip_send() into IPv4 and IPv6 specific functions David Gibson
2022-10-18  3:06   ` Stefano Brivio
2022-10-18 12:07     ` David Gibson
2022-10-17  8:58 ` [PATCH 10/14] tap: Split tap_ip6_send() into UDP and ICMP variants David Gibson
2022-10-17  8:58 ` [PATCH 11/14] ndp: Remove unneeded eh_source parameter David Gibson
2022-10-17  8:58 ` [PATCH 12/14] ndp: Use tap_icmp6_send() helper David Gibson
2022-10-17  8:58 ` [PATCH 13/14] tap: Split tap_ip4_send() into UDP and ICMP variants David Gibson
2022-10-18  3:06   ` Stefano Brivio
2022-10-18 12:07     ` David Gibson
2022-10-18 12:27       ` Stefano Brivio
2022-10-18 23:54         ` David Gibson
2022-10-17  8:58 ` [PATCH 14/14] dhcp: Use tap_udp4_send() helper in dhcp() David Gibson

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