Re: Status of the sata_sil driver for the VT8237
From: J. Ryan Earl
Date: Sun Mar 28 2004 - 15:46:43 EST
Jeff Garzik wrote:
Do you really plan to get 300MB/sec from two disks? :)
Yes, for about 50-100ms at a time, and -to- the disks, not from them;
well, the caches anyway. On 133MB/s PCI, more like 150-300ms of
saturation on bursts, and shared with the NICs. I have very short and
bursty I/O patterns as is typical in real-time applications. It's
easier to guarantee latency when your pipes are always at a small
fraction of their potential. 100ms higher latency, even for part of a
second, is quite noticeable in what I serve.
-ryan
PS 2.6 dropped my latencies under load by about 90% over 2.4! We're
talking 40-80ms application response time under high load to 8-10ms
under high load. <3
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