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From: Richard Weinberger <richard@nod.at>
To: anton ivanov <anton.ivanov@cambridgegreys.com>
Cc: linux-um <linux-um@lists.infradead.org>
Subject: Re: [PATCH] um: allow using glibc string functions instead of generics
Date: Tue, 10 Nov 2020 22:29:53 +0100 (CET)	[thread overview]
Message-ID: <1253718433.290759.1605043793706.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <ee2da9e0-2858-ef9c-b8b9-bdf569ec9bb4@cambridgegreys.com>

----- Ursprüngliche Mail -----
> Von: "anton ivanov" <anton.ivanov@cambridgegreys.com> 
>> On what workload did you see such a huge performance improvement?
> 
> File IO ~ 1% or thereabouts, iperf - 2-4%.
> 
>> The in-kernel variants of memcpy and such are already well optimized.
> 
> UML has no string.h in asm which means it falls back to
> asm-generic/string.h which in turn pulls in the ones from lib/string.c
>
> These are not optimized.

Hmmm, I think it should use the highly optimized variants from arch/x86.

Thanks,
//richard

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  reply	other threads:[~2020-11-10 21:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-10 16:30 [PATCH] um: allow using glibc string functions instead of generics anton.ivanov
2020-11-10 16:40 ` Johannes Berg
2020-11-10 16:54   ` Anton Ivanov
2020-11-10 20:13 ` Richard Weinberger
2020-11-10 20:56   ` Anton Ivanov
2020-11-10 21:29     ` Richard Weinberger [this message]
2020-11-10 21:33       ` Anton Ivanov
2020-11-10 21:39         ` Richard Weinberger
2020-11-11  7:13           ` Anton Ivanov
2020-11-11  8:26             ` Anton Ivanov
2020-11-11 15:14             ` Anton Ivanov
2020-11-11 15:59               ` Anton Ivanov
2020-11-11 18:09               ` Anton Ivanov
2020-11-11  9:49           ` Anton Ivanov

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