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Date: Wed, 28 Apr 2021 18:26:21 +0200 (CEST)
From: Dietmar Maurer <dietmar@proxmox.com>
To: Proxmox Backup Server development discussion <pbs-devel@lists.proxmox.com>, 
 Stefan Reiter <s.reiter@proxmox.com>
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Subject: Re: [pbs-devel] [PATCH proxmox-backup 2/3] RemoteChunkReader: add
 LRU cached variant
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> +    /// Create a new instance.
> +    ///
> +    /// Chunks listed in ``cache_hint`` are cached and kept in RAM, as well as the last
> +    /// 'cache_lru' accessed chunks (the latter via a mmap file).

Does that cache_hint really helps here? 
Have you tested without? If so, whats the difference?