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Date:   Thu, 17 Jan 2019 11:43:03 -0800 (PST)
From:   David Miller <>
Subject: Re: [RESEND PATCH net-next] Optimize sk_msg_clone() by data merge
 to end dst sg entry

From: Vakul Garg <>
Date: Wed, 16 Jan 2019 01:42:44 +0000

> Function sk_msg_clone has been modified to merge the data from source sg
> entry to destination sg entry if the cloned data resides in same page
> and is contiguous to the end entry of destination sk_msg. This improves
> kernel tls throughput to the tune of 10%.
> When the user space tls application calls sendmsg() with MSG_MORE, it leads
> to calling sk_msg_clone() with new data being cloned placed continuous to
> previously cloned data. Without this optimization, a new SG entry in
> the destination sk_msg i.e. rec->msg_plaintext in tls_clone_plaintext_msg()
> gets used. This leads to exhaustion of sg entries in rec->msg_plaintext
> even before a full 16K of allowable record data is accumulated. Hence we
> lose oppurtunity to encrypt and send a full 16K record.
> With this patch, the kernel tls can accumulate full 16K of record data
> irrespective of the size of data passed in sendmsg() with MSG_MORE.
> Signed-off-by: Vakul Garg <>


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