linux-kernel - Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput

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Message-ID: <CADvbK_fGg=QUxaKAZYei+4DLYW4QDzVaGWTC5GEP2+t42AjmSQ@mail.gmail.com>
Date:	Thu, 18 Aug 2016 02:06:50 +0800
From:	Xin Long <lucien.xin@...il.com>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	kernel test robot <xiaolong.ye@...el.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2% regression

>
> It doesn't seem memory is an issue.
>
> The whole dump is about the same.
> The MemFree and MemAvailable doesn't change much.
>
Hi, Aaron

1)
I talked with Marcelo about this one.
He said it might be related with cacheline.  the  new field distroyed
the prior cacheline. So on top of commit 826d253d57b1, pls only add
+       unsigned long prsctp_param;

to the end of struct sctp_chunk, then try.


2)
if 1) still doesn't work, I may think about to drop prsctp_param in
sctp_chunk, and reuse msg->expire_at. as for sent_count, I will
put it to the mem hole of sctp_chunk.

So pls also try the attachment patch,  on top of commit a6c2f792873a

Thanks.

View attachment "expire_at-reuse.patch" of type "text/x-patch" (2384 bytes)