Kent Overstreet <koverstreet@...> writes:
>
> On Mon, Oct 01, 2012 at 08:05:14PM +0000, Brad Walker wrote:
> > Kent Overstreet <koverstreet@...> writes:
> >
> > >
> > > What about cache_bypass_hits, cache_bypass_misses?
> > >
> >
> > cache_bypass_hits = 0
> > cache_bypass_misses = 0
>
> I should've just asked you for all the stats - what about
> cache_miss_collision?
bwalker:/sys/fs/bcache/dd10d09c-0605-462c-af85-8466b0aa2017/stats_total> ls
bypassed cache_bypass_misses cache_hits cache_misses
cache_bypass_hits cache_hit_ratio cache_miss_collisions cache_readaheads
bwalker:/sys/fs/bcache/dd10d09c-0605-462c-af85-8466b0aa2017/stats_total> cat *
0
0
0
98
162315691
0
2329081
0
bwalker:/sys/fs/bcache/dd10d09c-0605-462c-af85-8466b0aa2017/stats_total>
> Also, internal/cache_read_races?
cat /sys/fs/bcache/dd10d09c-0605-462c-af85-8466b0aa2017/interna/cache_read_races
0
> Perhaps stuff is getting evicted from the cache for some reason... How
> big is the SSD?
nellis: # sg_inq /dev/rssda
ATA device: model, serial number and firmware revision:
Micron P320h-MTFDGAR350SAH 000000001143020287B2 B1490300
nellis: # fdisk /dev/rssda
The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.
Command (m for help): p
Disk /dev/rssda: 350.1 GB, 350078754816 bytes
210 heads, 56 sectors/track, 58141 cylinders, total 683747568 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x16e1596f
Device Boot Start End Blocks Id System
/dev/rssda1 2048 683747567 341872760 83 Linux
Command (m for help):
> Is cache_replacement_policy lru? (the default - cache_replacement_policy
> is in cache0/)
LRU
> What's cache0/priority_stats say?
>
nellis: # cat priority_stats
Unused: 97%
Metadata: 0%
Average: 0
Sectors per Q: 582336
Quantiles: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1]
nellis: #
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