netdev - Re: [PATCH net-next 2/5] net: sctp: implement rfc6458, 5.3.4. SCTP

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Tue, 08 Jul 2014 11:34:33 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	David Laight <David.Laight@...LAB.COM>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"geirola@...il.com" <geirola@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH net-next 2/5] net: sctp: implement rfc6458, 5.3.4. SCTP_SNDINFO
 cmsg support

On 07/07/2014 10:46 AM, David Laight wrote:
...
>> @@ -1858,8 +1870,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>>   	pr_debug("%s: we have a valid association\n", __func__);
>>
>>   	if (!sinfo) {
>> -		/* If the user didn't specify SNDRCVINFO, make up one with
>> -		 * some defaults.
>> +		/* If the user didn't specify SNDINFO/SNDRCVINFO, make up
>> +		 * one with some defaults.
>>   		 */
>>   		memset(&default_sinfo, 0, sizeof(default_sinfo));
>
> Is this memset() needed?

This patch is not changing it, so feel free to propose one. If you zero
out the remaining fields only used for rx, you should be able to drop it,
but I guess all these micro-optimizations won't be that visible when we
have much more fundamental things to solve in SCTP stack's performance.

>>   		default_sinfo.sinfo_stream = asoc->default_stream;
>> @@ -1868,7 +1880,13 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
>>   		default_sinfo.sinfo_context = asoc->default_context;
>>   		default_sinfo.sinfo_timetolive = asoc->default_timetolive;
>>   		default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
>
> Maybe keep the parameters in a 'sinfo' structure within the 'asoc' ?

I think asocs and other SCTP structs are already 'fat' and use up too
many cachelines, they rather need a diet and some careful analysis on
access patterns.
--
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