Re: [PATCH v4 0/3] ext4: increase mbcache scalability

[Andi Kleen]

T Makphaibulchoke <tmac@xxxxxx> writes:

> The patch consists of three parts.
>
> The first part changes the implementation of both the block and hash chains of
> an mb_cache from list_head to hlist_bl_head and also introduces new members,
> including a spinlock to mb_cache_entry, as required by the second part.

spinlock per entry is usually overkill for larger hash tables.

Can you use a second smaller lock table that just has locks and is 
indexed by a subset of the hash key. Most likely a very small 
table is good enough.

Also I would be good to have some data on the additional memory consumption.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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