From: Rolf Fokkens <rolf-6w2rdlBuEQTpMFipWq+H6g@public.gmane.org>
To: Dirk Geschke <dirk-WMiem5eIfR0n5izryJqWLw@public.gmane.org>,
linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: bcache not working on large files?
Date: Tue, 22 Oct 2013 19:35:48 +0200 [thread overview]
Message-ID: <5266B774.6040202@rolffokkens.nl> (raw)
In-Reply-To: <20131022070830.GA20286-TGNR7510c4H9eX/OD4jYIkzuTB+3w3uf@public.gmane.org>
Hi Dirk,
On 10/22/2013 09:08 AM, Dirk Geschke wrote:
> I was just playing a little bit with bcache and it works fine. But
> if I try random IOPS writes (writeback) on a file larger than the
> cache, it seems not to work? At least I get a performance as without
> bcache.
>
> Did I miss something? Is caching disabled in such cases?
>
> Has anyone a hint for me, what is going wrong?
Bcache has some specific handling of sequential I/O:
http://evilpiepirate.org/git/linux-bcache.git/tree/Documentation/bcache.txt
Could this explain what you're seeing?
Rolf
next prev parent reply other threads:[~2013-10-22 17:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-22 7:08 bcache not working on large files? Dirk Geschke
[not found] ` <20131022070830.GA20286-TGNR7510c4H9eX/OD4jYIkzuTB+3w3uf@public.gmane.org>
2013-10-22 17:35 ` Rolf Fokkens [this message]
[not found] ` <5266B774.6040202-6w2rdlBuEQTpMFipWq+H6g@public.gmane.org>
2013-10-22 18:03 ` Dirk Geschke
[not found] ` <20131022180316.GA24473-TGNR7510c4H9eX/OD4jYIkzuTB+3w3uf@public.gmane.org>
2013-10-22 21:11 ` matthew patton
[not found] ` <1382476284.36900.YahooMailNeo-XYahOdtEMNlRBbKmAC7my5OW+3bF1jUfVpNB7YpNyf8@public.gmane.org>
2013-10-22 21:45 ` Dirk Geschke
[not found] ` <20131022214553.GC26186-TGNR7510c4H9eX/OD4jYIkzuTB+3w3uf@public.gmane.org>
2013-10-22 22:27 ` matthew patton
[not found] ` <1382480829.46079.YahooMailNeo-XYahOdtEMNkbWpotXP+qY5OW+3bF1jUfVpNB7YpNyf8@public.gmane.org>
2013-10-23 2:06 ` Paul B. Henson
2013-10-23 14:47 ` Dirk Geschke
2013-10-22 22:16 ` matthew patton
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