netdev - Re: network card with LRO (and TSO) in hardware?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Thu, 29 May 2008 21:11:01 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	netdev@...r.kernel.org
Subject: Re: network card with LRO (and TSO) in hardware?

On Thursday 29 May 2008, Rick Jones wrote:
>
> That second bit sounds very much like a "how long is a piece of string"
> question.  What size packets?  What sort of host system(s)?  How many
> concurrent flows/connections etc etc etc...
>

No restrictions... Any packet size (though I presume the lower the better), 
any kind of host systems, any number of concurrent flows (though I presume 
the fewer the better). I am just wondering what is the maximum packet rate 
ever seen by somebody, with hardware LRO.

I am asking this because, theoretically, with hardware LRO we should be able 
to achieve a very high packet rate when using a low MTU (like 64 or 128 
bytes). With software LRO I got a significant PPS increase for TCP traffic - 
from 100K (that with terrible hacks - generating traffic from kernel)  to 
140K (that cleanly, from user-space). So I am wondering what the hardware LRO 
will do.

Thanks,
tavi

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html