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Re: [Qemu-devel] [PATCH v2 00/11] curl: fix curl read

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH v2 00/11] curl: fix curl read
Date: Tue, 14 May 2013 10:22:53 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, May 14, 2013 at 10:26:19AM +0800, Fam Zheng wrote:
>  - CURLDataCache holds the user data read from libcurl, it is in a list
>    ordered by access, the used cache is moved to list head on access, so
>    the tail element is freed first. BDRVCURLState.cache_quota is the
>    threshold to start freeing cache.

Can you explain the need for a cache?

The guest kernel already does readahead if it wants to.  It can be tuned
from inside the guest if performance doesn't meet expectations.  The
block/curl.c-specific cache cannot be tuned from the guest.


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