linux-kernel - RE: [PATCH] ceph: optimize ceph_base64

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Message-ID: <f4f33ae461e0f1cf2f28d1c22546bd67cd9c4da3.camel@ibm.com>
Date: Tue, 2 Sep 2025 21:21:14 +0000
From: Viacheslav Dubeyko <Slava.Dubeyko@....com>
To: "409411716@....tku.edu.tw" <409411716@....tku.edu.tw>,
        "visitorckw@...il.com" <visitorckw@...il.com>
CC: Xiubo Li <xiubli@...hat.com>, "idryomov@...il.com" <idryomov@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ceph-devel@...r.kernel.org" <ceph-devel@...r.kernel.org>
Subject: RE: [PATCH] ceph: optimize ceph_base64_encode() with block processing

On Wed, 2025-09-03 at 05:05 +0800, Kuan-Wei Chiu wrote:
> On Tue, Sep 02, 2025 at 07:37:22PM +0000, Viacheslav Dubeyko wrote:
> > On Sat, 2025-08-30 at 21:28 +0800, Guan-Chun Wu wrote:
> > > Previously, ceph_base64_encode() used a bitstream approach, handling one
> > > input byte at a time and performing extra bit operations. While correct,
> > > this method was suboptimal.
> > > 
> > 
> > Sounds interesting!
> > 
> > Is ceph_base64_decode() efficient then?
> > Do we have something in crypto library of Linux kernel? Maybe we can use
> > something efficient enough from there?
> > 
> Hi Viacheslav,
> 
> FYI, we already have base64 encode/decode implementations in
> lib/base64.c. As discussed in another thread [1], I think we can put
> the optimized version there and have users switch to call the library
> functions.
> 
> [1]: https://lore.kernel.org/lkml/38753d95-8503-4b72-9590-cb129aa49a41@t-8ch.de/  
> 
> 

Sounds great! Generalized version of this algorithm is much better than
supporting some implementation in Ceph code.

Thanks,
Slava.