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Do all contemporary SSD's have latencies (seek times) of < 1 ms.?

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Railgun

Member
Joined
May 7, 2011
Generally yes but looking solely at latency by itself and at a moment of time is useless in this context.
 
OP
M

magellan

Member
Joined
Jul 20, 2002
Generally yes but looking solely at latency by itself and at a moment of time is useless in this context.

I didn't know how to phrase my question correctly. I guess even seek time for HDD's is an average measurement and one only calculated while the platters are actually spinning.

So is latency the correct term for SSD's?

Are there certain conditions under which an SSD would have > 1 ms. latency? Maybe when it's performing its garbage collection routines?
 

Arbiter Odie

Member
Joined
Aug 4, 2011
Latency is the correct term in correlation to seek time. I don't know about the garbage collection though.
I wonder if any of the Emmc drives have higher latencies. I'm having trouble finding benchmarks for them.
 

Railgun

Member
Joined
May 7, 2011
I didn't know how to phrase my question correctly. I guess even seek time for HDD's is an average measurement and one only calculated while the platters are actually spinning.

So is latency the correct term for SSD's?

Are there certain conditions under which an SSD would have > 1 ms. latency? Maybe when it's performing its garbage collection routines?

There's a relationship I think to queue depth and latency. For example, in AnandTech's bench, they measure latency in the context of

Percentage of >10ms Service Times
...among others. So from that perspective, the use case will somewhat determine real world latency. But for all intents and purposes, yeah...latency is negligible.